begin[syntax] begin expr expr2 ...
R5RS, R6RS
Some implementations allow begin with no exprs: Chicken, STk, Gauche
[module clause] begin expr ...
Chicken: this form can be used in the module clause in define-module.
See Chicken:ModuleSystem?.
[configuration language] begin expr ...
Scheme48: used in configuration language. See Scheme48:ModuleSystem.
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