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 Branches to and returns from a subroutine. For a more structured alternative
 to GOSUB...RETURN subroutines, use SUB and FUNCTION statements.
 
    GOSUB line-label-to
    .
    .
    .
    RETURN [line-label-resume]
 
    ■ line-label-to          Line number or label of the first line of the
                             subroutine
 
    ■ line-label-resume      Line number or label where the subroutine
                             returns; if omitted, execution continues at the
                             statement following the GOSUB keyword
 
 See Also
    ◄CALL Statement (Basic Procedures)►      ◄FUNCTION Statement►
    ◄Loops and Decision Structures►          ◄SUB Statement►