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OPEN <0-7>, READ|TRUNCATE|APPEND "<A-Z>" [ONREAD GOSUB <line number>] [ONWRITE GOSUB <line number>]
READ #<0-7>, <variable> [, ...]
WRITE #<0-7>, <variable>|<number> [, ...]
<variable> = EOF(<0-7>)
CLOSE <0-7>