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4.2. The Mythical Standard Condition

REXX Language Level 4.00 has six different conditions. However,
each of these is a special case of a mythical, non-existing,
standard condition. In order to better understand the real
conditions, we start by explaining how a standard condition work.

In the examples below, we will call our non-existing standard
condition MYTH. Note that these examples will not be executable on
any REXX implementation.