
Go up to If...else...command (single sortword environment)
Go forward to Comparison operators (EQ,NE,GE,LE,GT,LT)
Validation test operator (VALID)
IF <sortword> VALID ...
where VALID means `present in the event' or `set true
by some previous statement in the sortfile',
ie. by an arithmetic assignment, EXTRACT,
LOOPEXTRACT or CALL statement.
For each such word, <statements1> are executed.
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