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HELP UNLESS                                        Steven Hardy, January 1978

The conditional statement

    unless <condition> then <action> endunless

is equivalent to:

    if not(<condition>) then <action> endif

UNLESS statements may have an *ELSE branch (and also *ELSEIF and *ELSEUNLESS
branches).

See HELP
    *ELSEUNLESS   - summary of use of ELSEUNLESS in conditionals
    *ELSEIF       - summary of use of ELSEIF
    *ELSE         - summary of use of ELSE
    *CONDITIONALS - summary of conditional statements