Develop an on-chain orderbook DEX.
DEX Specifications:
- Trading Pairs: ${{TRADING_PAIRS}}
- Order Types: ${{ORDER_TYPES}}
- Settlement: ${{SETTLEMENT_MODEL}}
- Target Chain: ${{BLOCKCHAIN}}
DEX Architecture:
1. **Orderbook Contract**
```solidity
// Order structure
// Orderbook management
// Matching engine
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[{TRADING_PAIRS][{ORDER_TYPES][{SETTLEMENT_MODEL][{BLOCKCHAIN]