1 03/31/83  verify
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 3 Syntax:  verify STRA STRB
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 6 Syntax as active function:  [verify STRA STRB]
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 9 Function:  returns an integer representing the first character position
10 in STRA that contains a character that does not occur anywhere in STRB.
11 If every character of STRA occurs in STRB, 0 is returned.