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In page PowerBASIC:
"The following program is an example of the ALGOL-like BASIC dialect that Turbo Basic supported. Unlike traditional BASIC,[citation needed] which used line numbers and had limited control structures and no support for ALGOL-like subroutines, modern BASIC dialects starting at this period were extended to make the language compatible with modern structured programming style by making line numbers optional and adding the control structures and subroutine definitions needed for structured programming.