What is the correct constraint for node 2 in the following diagram? 
Definitions:
Exchange Rate
The price at which one currency can be exchanged for another currency.
Credit Terms
Conditions under which credit is extended by a lender to a borrower, including the repayment period and interest rate.
Direct Quotation
A currency quotation method where the local currency is fixed, and the foreign currency varies.
Bid-ask Spread
The difference between the highest price a buyer is willing to pay for an asset (bid) and the lowest price a seller is willing to accept (ask).
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