String comparison tests: multi-part

Like numeric comparisons, an unparenthesized comparison can consist of more than two parts, provided the parts are compatible. The operator "!=" is never permitted in a multi-part comparison, and "<" or "<=" cannot be mixed with ">" or ">=". Furthermore, ul comparisons cannot be mixed with non-ul comparisons.

A multi-part sting comparison must consist of operators from any single one of the following sets:

• =, <, or <=
• =, >, or >=
• = ul, < ul, or <= ul
• = ul, > ul, or >= ul

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