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 Variable Initialization and Stepping Clauses.
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