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All answers having "Computer command" as clue:

3 Character Answers:

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RUN



4 Character Answers:

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GOTO

HELP

OPEN

QUIT

REDO

SAVE

SEND

SORT

UNDO



5 Character Answers:

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ENTER

MACRO

PRINT



6 Character Answers:

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DELETE

SAVEAS



7 Character Answers:

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RESTART