If a value at the high end of one range also appears at the low end of another range,
and you do not use the < exclusion operator, then PROC FORMAT assigns the value
to the first range. For example, in the following ranges, the value AJ is part of the
first range:
'AA'-'AJ'=1 'AJ'-'AZ'=2
In this example, to include the value AJ in the second range, use the < exclusion
operator on the first range:
'AA'-<'AJ'=1 'AJ'-'AZ'=2
If you overlap values in ranges, then PROC FORMAT returns an error message
unless, for the VALUE statement, the MULTILABEL option is specified. For
example, the following ranges will cause an error: 'AA'-'AK'=1 'AJ'-'AZ'=2.
Each ...
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