CLHS: Section 6.1.1.5.1

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## 6.1.1.5.1 Summary of Variable Initialization and Stepping Clauses

The `for` and `as` constructs provide iteration control clauses that establish a variable to be initialized. `for` and `as` clauses can be combined with the loop keyword `and` to get parallel initialization and stepping[1]. Otherwise, the initialization and stepping[1] are sequential.

The `with` construct is similar to a single let clause. `with` clauses can be combined using the loop keyword `and` to get parallel initialization.

For more information, see Section 6.1.2 (Variable Initialization and Stepping Clauses).

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