I. Executive Summary: The Core of Enterprise AI is Trustworthy Business Execution, Not Models
II. Role Positioning of an FDE: Bridging Business Reality and Engineering Systems
III. Underlying Commercial Logic of B2B AI Adoption
3.1 Enterprises Purchase Business Outcomes, Not AI Tools
Central Cooling Plant Optimization Recommendations → O&M staff adjust chiller combination settings → Energy consumption per unit of cooling decreases → Annual electricity cost declines. 冷站运行优化建议 → 运维人员调整机组组合 → 单位冷量能耗下降 → 年度电费降低。
Intelligent Bid Requirement Extraction → Reduction in human oversight and redundant cross-checking → Bidding cycle time shortened and pricing errors minimized → Increased bidding efficiency and controllable gross margins. 智能投标需求提取 → 减少人工漏项与重复核对 → 缩短投标周期并降低报价错误 → 提高投标效率和项目毛利可控性。
3.2 Risk Cannot Be Completely Transferred; It Can Only Be Identified, Allocated, and Encapsulated
| English source | 中文原文 |
|---|---|
| FDE-Owned FDE Team System architecture, software defects, operator logic errors, deployment failures | FDE 归属 FDE 团队 系统架构、软件缺陷、算子逻辑错误、部署失败 |
| Client-Owned Client Organization Source data quality, operational execution, organizational adoption, physical environment | 客户归属 客户组织 源数据质量、业务执行、组织推广采用、物理环境 |
| Joint / Force Majeure Negotiated Third-party API outages, regulatory changes, underlying model provider policy changes | 共同/不可抗力 协商确定 第三方 API 中断、监管政策变更、底层模型厂商策略调整 |
3.3 The Commercial Opportunity for FDEs Lies in the Industry Execution Layer
IV. Enterprise Knowledge Deconstruction: From Tacit Expertise to Executable Assets
| English source | 中文原文 |
|---|---|
| Explicit Rules Policies, standards, contracts, SOPs, technical specifications | 显性规则 制度、标准、合同、SOP、技术规范 |
| Data Rules Spreadsheet formulas, database logic, reporting metrics definitions | 数据规则 Excel公式、数据库逻辑、报表口径 |
| Behavioral Rules System operation logs, business process logs | 行为规则 系统操作记录、业务流程日志 |
| Decision Expertise Expert judgment, historical case studies, exception resolution records | 决策经验 专家判断、历史案例、异常处置记录 |
| Organizational Power Approval authorities, veto powers, accountability attributions | 组织权力 审批权限、否决权、责任归属 |
4.1 Knowledge Decay Management
V. Overall Architecture: Four Planes and One Line of Accountability
┌─────────────────────────────────────────────────────────────────┐ │ I. Data & Knowledge Plane │ │ Data Sources, Documents, Master Data, RAG, ACLs, Lineage │ ├─────────────────────────────────────────────────────────────────┤ │ II. Probabilistic Cognitive Plane │ │ LLMs, Intent Parsing, Extraction, Recommendations, Explanations │ ├─────────────────────────────────────────────────────────────────┤ │ III. Deterministic Execution Plane │ │ State Machines, Operators, Rule Engines, Solvers, Transactions │ ├─────────────────────────────────────────────────────────────────┤ │ IV. Assurance & Evidence Plane │ │ Contracts, Tests, Policies, Audits, Rollback, Acceptance, SLAs │ └─────────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────────┐ │ 一、数据与知识平面 │ │ 数据源、文档、主数据、RAG、权限控制列表(ACL)、血缘 │ ├─────────────────────────────────────────────────────────────────┤ │ 二、概率性认知平面 │ │ 大模型、意图解析、抽取、建议、解释 │ ├─────────────────────────────────────────────────────────────────┤ │ 三、确定性执行平面 │ │ 状态机、算子、规则引擎、求解器、事务 │ ├─────────────────────────────────────────────────────────────────┤ │ 四、保证与证据平面 │ │ 契约、测试、策略、审计、回滚、验收、SLA │ └─────────────────────────────────────────────────────────────────┘
| English source | 中文原文 |
|---|---|
| Who can read the data ACL policies in the Data & Knowledge Plane | 谁可以读取数据 数据与知识平面中的 ACL 策略 |
| Who can invoke the cognitive layer Service identity + scoped API keys | 谁可以调用认知层 服务身份认证 + 受限 API 密钥 |
| Who can generate proposals Role-based operator permissions | 谁可以生成方案 基于角色的算子权限 |
| Who can modify configurations Change management workflow with audit trail | 谁可以修改配置 带有审计追踪的变更管理工作流 |
| Who can issue final quotes Human approval gate (Level D operator) | 谁可以发布最终报价 人工审批节点(D 类算子) |
| Who can execute physical production operations Safety interlock authorization (Level E; never LLM-initiated) | 谁可以执行物理生产操作 安全联锁授权(E 类算子;严禁由大模型直接触发) |
| Who bears ultimate business outcome responsibility Designated human role, documented in SLA | 谁对最终业务结果负责 在 SLA 中记录的指定责任人角色 |
VI. Boundaries Between Probabilistic Cognition and Deterministic Execution
6.1 Tasks Suitable for LLMs
6.2 Tasks LLMs Should NOT Directly Execute
[ LLM ] ──(Understands Intent & Constraints)──> [ Mathematical Solver ] │ (Optimizes Calculations) │ ▼ [ Human Supervisor ] <──(Authorize)── [ Control System (PLC) ]
[ 大模型 ] ──(理解意图与约束)──> [ 数学求解器 ] │ (执行优化计算) │ ▼ [ 人工监督 ] <──(授权)── [ 控制系统 (PLC) ]
VII. Security Architecture: Transitioning from Personal Trust to Zero-Trust Engineering
7.1 Structural Contradiction Between Capability and Trust
7.2 Core Security Principles
7.3 External Development and Private Enterprise Deployment
7.4 Model Context Egress Gateway
7.5 Adversarial Input Handling
7.6 LLM Provider Resilience
[ Provider Outage Detected ] │ ├── Mode A: Route to secondary provider (if contractually permitted) │ ├── Mode B: Fall back to on-premises/edge inference (reduced capability) │ ├── Mode C: Suspend cognitive-dependent workflows; continue deterministic-only paths │ └── Mode D: Notify operators; surface manual override interfaces
[ 检测到模型服务中断 ] │ ├── 模式 A:路由至备用模型厂商(若合同条款允许) │ ├── 模式 B:降级至本地/边缘端推理(能力有所收缩) │ ├── 模式 C:暂停依赖认知的流程;仅继续纯确定性路径 │ └── 模式 D:通知操作员;弹出人工接管/干预界面
7.7 Prompt Versioning and Governance
VIII. Hybrid RAG Architecture: Search Results Are Evidence, Not Facts Themselves
User Query ──> [Tenant & ACL Filter] ──> [Intent & Metadata Classifier] │ ▼ [ Cross-Encoder Re-ranker ] <──(Fusion)── [ BM25 + Vector Hybrid Recall ] │ ▼ [ Sufficiency Assessment ] ──(Sufficient)──> [ Grounded Citation Generation ] │ (Insufficient) │ ▼ [ Refusal / Fallback ]
用户 Query ──> [租户与 ACL 过滤] ──> [意图与元数据分类器] │ ▼ [ Cross-Encoder 重排 ] <──(融合)── [ BM25 + 向量混合召回 ] │ ▼ [ 证据充分性评估 ] ──(证据充分)──> [ 带引用的事实生成 ] │ (证据不足) │ ▼ [ 拒答 / 降级 ]
8.1 Multi-Tenancy and Tenant Isolation in RAG
IX. Code-First Agent Production Paradigm
9.1 Recommended Pattern 1: LLM Generates Declarative Workflows Only
9.2 Recommended Pattern 2: LLM Generates Operators in the Development Phase
9.3 Secure Sandbox Execution (When Dynamic Code Is Unavoidable)
X. Atomic Operators, Declarative DAGs, and Business State Machines
10.1 Definition of an Atomic Operator
operator_id: pricing.calculate_total
version: 2.1.0
input_schema: pricing-input-v3
output_schema: pricing-output-v2
side_effect: none
determinism: strict
timeout_ms: 500
preconditions:
- quantity > 0
postconditions:
- total_price >= 0
invariants:
- total_price == subtotal + tax - discount10.2 Operator Risk Classification
| English source | 中文原文 |
|---|---|
| A Pure Functions (No Side Effects) Unit conversion, tax calculation | A 类 纯函数,无副作用 单位换算、税费计算 |
| B Read-Only Access Querying price catalogs, reading telemetry | B 类 只读访问 查询价格库、读取设备遥测数据 |
| C Reversible Write Operations Draft creation, dispatching work orders | C 类 可逆写操作 创建草稿、生成工单 |
| D Critical Business Writes Publishing binding quotes, approving purchase orders | D 类 重要业务写操作 发布有约束力的报价、批准采购订单 |
| E Physical Production Control Writing device setpoints, start/stop equipment commands | E 类 物理生产控制操作 修改设备设定值、启停设备指令 |
10.3 Roles of DAGs, State Machines, and Rule Engines
XI. Design by Contract: Constraining Errors Rather Than Claiming Infallibility
[ Error Detected ] │ ├── Level 0: Pre-execution contract check — validate preconditions before invocation │ (cheapest; catches predictable failures before they occur) │ ├── Level 1: Fall back to a certified secondary algorithm │ ├── Level 2: Degrade functional scope (Read-only / Advisory mode) │ ├── Level 3: Route to manual approval & expert review │ └── Level 4: Enter a secure safe-state and halt execution
[ 检测到错误 ] │ ├── 0 级:执行前契约检查——在调用前校验前置条件 │ (成本最低;在可预测的错误发生前就将其拦截) │ ├── 1 级:切换到经过认证的备用算法 │ ├── 2 级:降低功能范围(仅只读/建议模式) │ ├── 3 级:转人工审批与专家复核 │ └── 4 级:进入安全状态并停止执行
XII. The Five Pillars of Deterministic Delivery
12.1 Data Determinism
12.2 Logic Determinism
12.3 Execution Determinism
12.4 Verification Determinism
12.5 Accountability Determinism
XIII. Chain of Evidence: Auditing Every Formal Execution
execution_id: EXE-20260801-001
workflow_hash: sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
operator_versions:
pricing.calculate_total: 2.1.0
prompt_versions:
extraction.rfq_parser: 1.4.2
recommendation.energy_optimizer: 2.0.0
policy_version: policy-4.2
input_hash: sha256:8f434346648f6b96df89dda901c5176b10a6d83961dd3c1ac88b59b2dc327aa4
data_snapshot: pricing-db-2026-08-01-v1
model_used_for_proposal: model-x-v1
approval_id: APR-0812
result_hash: sha256:5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b46729d73a27fb57e9
contract_checks:
preconditions: passed
postconditions: passed
invariants: passed
cognitive_layer_status: available
input_source_classification: internalXIV. End-to-End FDE Project Business Lifecycle
14.1 Opportunity Identification
14.2 Business Discovery
14.3 Value Baseline Establishment
14.4 Proof of Value (PoV) Verification
14.5 Engineering Implementation
14.6 Asset Extraction
XV. Product Architecture: Core Platform, Industry Packs, and Customer Overlays
┌──────────────────────────────────────────────────────────────┐ │ Tier 3: Customer Overlay │ │ Client Branding, Interfaces, Custom Rules, Forms, Workflows │ ├──────────────────────────────────────────────────────────────┤ │ Tier 2: Industry Packs │ │ Bidding, Energy Management, Digital Twin, O&M Modules │ ├──────────────────────────────────────────────────────────────┤ │ Tier 1: FDE Core Platform │ │ ACL, Workflows, Audit, Files, Alerts, Agents, Deployment/O&M │ └──────────────────────────────────────────────────────────────┘
┌──────────────────────────────────────────────────────────────┐ │ 第三层:Customer Overlay(客户定制层) │ │ 客户品牌、接口适配、自定义规则、表单、特殊工作流 │ ├──────────────────────────────────────────────────────────────┤ │ 第二层:Industry Packs(行业包层) │ │ 投标报价、综合能源、数字孪生、设备运维等行业模块 │ ├──────────────────────────────────────────────────────────────┤ │ 第一层:FDE Core Platform(核心平台层) │ │ 权限控制、工作流引擎、审计、文件、告警、Agent、部署运维 │ └──────────────────────────────────────────────────────────────┘
XVI. FDE Application Principles in Typical Scenarios
16.1 Intelligent Bidding and Quoting
[Tender Document Ingestion] │ ▼ [Sanitization Layer] ──> [External Document Adversarial Check] │ ▼ [LLM: Requirement & Constraint Extraction] │ ▼ [Schema Validation of Extracted Fields] │ ▼ [Operator: Cost Component Mapping] │ ▼ [Operator: Price Calculation with Margin Rules] │ ▼ [Operator: Risk Rating & Clause Flagging] │ ▼ [LLM: Proposal Draft Generation] │ ▼ [Human Review & Authorization Gate] ──(Reject / Revise)──> [Loop] │ (Approve) │ ▼ [Binding Quote Issuance + Evidence Package]
[ 招标文件导入 ] │ ▼ [ 内容清洗/脱敏层 ] ──> [ 外部文档对抗性检查 ] │ ▼ [ 大模型:需求与约束提取 ] │ ▼ [ 提取字段的 Schema 校验 ] │ ▼ [ 算子:成本组件映射 ] │ ▼ [ 算子:带利润率规则的价格计算 ] │ ▼ [ 算子:风险评级与条款标记 ] │ ▼ [ 大模型:方案草案生成 ] │ ▼ [ 人工审查与授权节点 ] ──(驳回/修改)──> [ 循环 ] │ (批准) │ ▼ [ 发布有约束力的报价 + 证据包 ]
16.2 Integrated Energy Services
[Equipment Telemetry Ingestion via OPC-UA / MQTT] │ ▼ [Operator: Baseline Energy Consumption Calculation] │ ▼ [Operator: Anomaly Detection & Deviation Flagging] │ ▼ [LLM: Root Cause Analysis & Optimization Opportunity Identification] │ ▼ [Mathematical Solver: Setpoint Optimization under Physical Constraints] │ ▼ [LLM: Human-Readable Recommendation with Explanation] │ ▼ [Human Operator: Review & Authorization] │ ▼ [IT/OT Gateway: Hardware Interlock Validation] │ ▼ [Control System: Approved Setpoint Application] │ ▼ [Operator: Outcome Monitoring & Value Measurement]
[ 设备遥测数据导入(通过 OPC-UA / MQTT)] │ ▼ [ 算子:能耗基线计算 ] │ ▼ [ 算子:异常检测与偏差标记 ] │ ▼ [ 大模型:根本原因分析与优化机会识别 ] │ ▼ [ 数学求解器:物理约束下的设定值优化 ] │ ▼ [ 大模型:生成可读的可解释优化建议 ] │ ▼ [ 人工操作员:审查与授权 ] │ ▼ [ IT/OT 网关:硬件联锁校验 ] │ ▼ [ 控制系统:应用已批准的设定值 ] │ ▼ [ 算子:结果监测与价值测量 ]
16.3 Industrial Digital Twins
XVII. Pre-Initiation Project Checklist
17.1 Business Conditions
17.2 Data Conditions
17.3 Technical Conditions
17.4 Risk Conditions
17.5 Commercial Conditions
XVIII. Cardinal Principles for FDE Projects
XIX. Observability Architecture for Production AI Systems
19.1 Correlation Identity
19.2 Observability Dimensions
| English source | 中文原文 |
|---|---|
| Cognitive Layer Latency per LLM call, token usage per request, prompt template version, extraction confidence scores, schema validation pass/fail rates | 认知层 每次大模型调用延迟、每次请求 Token 消耗、Prompt 模板版本、抽取置信度得分、Schema 校验通过率/失败率 |
| RAG Layer Recall@K, MRR, sufficiency assessment outcomes, stale citation rate, ACL filter hit rate, cross-tenant retrieval rate | RAG 层 Recall@K、MRR、证据充分性评估结果、过期文档引用率、ACL 过滤命中率、跨租户召回率 |
| Execution Layer Operator latency, precondition failure rates, contract violation counts, rollback event frequency | 执行层 算子延迟、前置条件失败率、契约违例次数、回滚事件触发频率 |
| Human-in-the-Loop Approval latency, override rate by operator type, escalation frequency | 人机交互层 审批延迟、按算子类型统计的人工干预/覆盖率、升级上报频率 |
| Business Layer The actual value metrics — energy cost delta, bid win rate, error reduction rate — not just system metrics | 业务层 真实的业务价值指标——电费降低额、中标率、错误率下降幅度——而非仅仅是系统性能指标 |
19.3 Behavioral Drift Detection
XX. Cost Governance of the Cognitive Layer
20.1 Cost Architecture Principles
20.2 Cost Optimization Hierarchy
1. Eliminate — Can this cognitive step be replaced by a deterministic rule?
2. Cache — Has this exact (or semantically equivalent) query been answered recently?
3. Compress — Can the context window be minimized without losing necessary information?
4. Route — Can a smaller / cheaper model handle this task class adequately?
2. 缓存 (Cache) —— 近期是否回答过完全相同(或语义等价)的查询?
3. 压缩 (Compress) —— 上下文窗口是否可以在不丢失必要信息的前提下精简?
4. 路由 (Route) —— 更小/更便宜的模型是否足以胜任此类任务?
5. 批处理 (Batch) —— 对于非紧急任务,异步批处理能否替代实时调用?
20.3 Commercial Implication
XXI. Organizational Change Management
21.1 Change Adoption Framework
| English source | 中文原文 |
|---|---|
| Discovery Identify adoption champions and resistors early; understand the informal power structure, not just the org chart | 业务发现 尽早识别推广积极分子与潜在阻力者;理解非正式的权力结构,而非仅仅看组织架构图 |
| PoV Design Select the PoV user group based on willingness AND organizational influence | PoV 设计 基于意愿以及组织影响力选择 PoV 用户群 |
| Implementation Co-design the human-in-the-loop interface with actual operators, not management proxies | 工程实施 与一线操作员共创人机交互界面,而非通过管理层的代理人 |
| Deployment Define a formal trust escalation path; begin in advisory mode before any execution authority is delegated | 上线部署 建立正式的信任阶梯升级路径;在下放任何执行权之前,先从“纯建议模式”开始 |
| Steady State Establish a feedback mechanism for operators to flag degraded recommendations; treat operator feedback as a data source | 稳态运营 建立反馈机制让操作员标记质量下降的建议;将操作员的反馈视为一种重要的数据源 |
21.2 Trust Escalation Path
Stage 1: Advisory Only
System generates recommendations; humans execute independently.
Duration: Until recommendation acceptance rate > threshold.
Stage 2: Assisted Execution
Human reviews and explicitly approves each recommendation before execution.
Duration: Until override rate stabilizes below threshold.
Stage 3: Supervised Automation
System executes autonomously; human monitors and can override.
Duration: Until exception rate and override patterns are well-characterized.
Stage 4: Exception-Only Oversight
系统生成建议;人工独立评估并执行。
持续时间:直至建议采纳率 > 设定阈值。
阶段 2:辅助执行模式(Assisted Execution)
人工在执行前审查并明确批准每条建议。
持续时间:直至人工干预/覆盖率稳定低于阈值。
阶段 3:受监督的自动化模式(Supervised Automation)
系统自主执行;人工进行监控并在必要时接管覆盖。
持续时间:直至异常率和人工干预模式被充分表征。
阶段 4:例外接管模式(Exception-Only Oversight)
仅在系统预警不确定性、异常或突破契约时,人工才接入干预。
XXII. Regulatory Compliance Positioning
22.1 Key Regulatory Frameworks
| English source | 中文原文 |
|---|---|
| EU AI Act AI systems deployed in EU; risk-tiered requirements Industrial systems affecting worker safety or critical infrastructure are likely classified as "high-risk"; require conformity assessment, human oversight obligations, and technical documentation | 欧盟 AI 法案 在欧盟部署的 AI 系统;基于风险分级的要求 影响工人安全或关键基础设施的工业系统极可能被归为“高风险”;需要符合性评估、人工监督义务与完整技术文档 |
| GDPR / PIPL / State Privacy Laws Personal data processing Relevant when enterprise AI systems process employee or customer data; affects RAG corpus design and data lineage requirements | GDPR / 个人信息保护法(PIPL)等 个人数据处理 当企业 AI 系统处理员工或客户数据时相关;直接影响 RAG 语料库设计与数据血缘要求 |
| Sector-Specific Regulations Energy (NERC CIP), Finance (SR 11-7), Healthcare (FDA SaMD) Domain-dependent; often predate AI-specific law but impose model validation, audit requirements, and explainability obligations | 特定行业监管规程 能源(NERC CIP)、金融(SR 11-7)、医疗(FDA SaMD) 视具体领域而定;通常早于 AI 专项立法,但提出了模型验证、审计要求与可解释性义务 |
| Export Control (BIS / OFAC) Cross-border data and technology transfer Directly relevant to cross-border data rules in Section 7.2; affects cloud provider selection and data residency | 出口管制(BIS / OFAC 等) 跨国/跨境数据与技术转移 与第七.二节的数据出境规则直接相关;影响云服务商选择与数据本地化留存 |
22.2 Compliance Architecture Implications
XXIII. Integration Architecture for Industrial Operational Technology
23.1 OT Integration Protocols
| English source | 中文原文 |
|---|---|
| OPC-UA Industrial device data (PLCs, SCADA, sensors) Standard for structured equipment telemetry; supports security profiles; recommended primary IT/OT integration boundary | OPC-UA 工业设备数据(PLC、SCADA、传感器) 结构化设备遥测数据的标准;支持安全配置文件;推荐作为主要的 IT/OT 集成边界 |
| MQTT / Sparkplug B Lightweight IoT telemetry, edge-to-cloud Appropriate for high-frequency sensor data where OPC-UA overhead is prohibitive | MQTT / Sparkplug B 轻量级 IoT 遥测,边缘到云端 适用于 OPC-UA 协议开销过大的高频传感器数据传输 |
| Modbus / DNP3 Legacy field devices Read-only integration only; never write-back via AI-generated commands without hardware interlock | Modbus / DNP3 传统现场设备 仅限只读集成;严禁在未经硬件联锁的情况下通过 AI 生成的指令进行反写 |
| ERP APIs (SAP, Oracle) Business data (work orders, asset master data, cost centers) Use vendor-provided APIs with service account identities; never direct database access | ERP API (SAP、Oracle等) 业务数据(工单、资产主数据、成本中心) 使用厂商提供的 API 及服务账号身份;严禁直接读取底层数据库 |
23.2 The IT/OT Boundary
AI System (IT Domain) │ ▼ [Validated Setpoint Request] ──> [IT/OT Gateway with Hardware Interlock] │ [Physical Safety Relay] │ ▼ PLC / DCS (OT Domain)
AI 系统 (IT 域) │ ▼ [ 经过校验的设定值请求 ] ──> [ 带硬件联锁的 IT/OT 网关 ] │ [ 物理安全继电器 ] │ ▼ PLC / DCS (OT 域)
23.3 Air-Gapped and Limited Connectivity Scenarios
XXIV. Cognitive Layer Evaluation Framework
24.1 Evaluation Dimensions
| English source | 中文原文 |
|---|---|
| Extraction Accuracy Human-labeled golden set; precision/recall per field type ≥ 95% for pricing and contractual fields; ≥ 90% for free-text classification | 提取准确率 人工标注的黄金数据集;按字段类型计算精确率/召回率 价格与合同条款字段 ≥ 95%;自由文本分类 ≥ 90% |
| Recommendation Relevance Business expert panel review of historical recommendations vs. system outputs on identical inputs Defined agreement rate with domain expert | 建议相关性 业务专家面板对比审查:针对完全相同的输入,对比历史人工建议与系统输出 与领域专家达成预先定义的认同率 |
| Explanation Fidelity Verify that each cited evidence source actually supports the stated conclusion 100% of citations must be traceable to source documents in the evidence record | 解释忠实度 验证引用的每条证据来源是否确实支撑所给出的结论 100% 的引用必须能追溯到证据记录中的源文档 |
| Boundary Respect Adversarial prompts designed to elicit out-of-scope or Level D/E outputs Zero tolerance for unsanctioned authorization-level outputs | 边界合规性 设计对抗性 Prompt,试图诱导系统输出越界或 D/E 类授权指令 对未授权越权指令输出零容忍 |
| Temporal Stability Re-run golden test set on a defined schedule; alert on accuracy degradation Alert threshold: any metric declining > 5% between evaluation cycles | 时间稳定性 按既定周期重新运行黄金测试集;对准确率下降发出预警 预警阈值:评估周期间任何指标下滑 > 5% |