A DICTIONARY OF APL Kenneth E. Iverson APL is a formal, imperative language. Because it is imperative, a sentence may be called an instruction, and may be executed to produce a result. In illustrations used here an instruction will be indented, and the result of its execution will be shown on the following line without indentation. Thus: 5 6 7 7 I: L E T T E R S AND WORDS . . . . . . . . . . . . . . . . . . . . . . . . II: G R A M M A R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. NOUNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Numeric and literal Tokens and pronouns Arrays Open and boxed B. VERBS . . . . . . .
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