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There is no difference between the two forms, <= and ≤.
String comparison is done according to the ASCII sequence. This yields alphabetical results. Lowercase characters sort after all uppercase characters, that is, "A" < "Z" < "a" < "z".
UserTalk employs automatic type coercion when evaluating arithmetic and comparative operations; the two expressions need not be of the same type to be compared.
The ≤ symbol can be entered at the keyboard with Option-<
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