colon triples, the sentence numbers, the empty sentences that separate the paragraphs, the colon prefixes and the colon suffix. The header is implied by the first sentence. AcknowledEcment. Initially, I used double quote as the punctuation symbol and had an arrow after the name of the verb. When Jim Brown reminded me of the use of double quote as a national character in APL2, I substituted the colon in both positions. The constraint, taken not given, improves the statement considerably. Repetition of the colon enhances the punctuation attribute, unifies the sentence, and distinguishes it more sharply from one which executes. ~J~ereR~. [3] I v e i ~ n , K.E. and Wooster, P.K., A Function Definition Operator, A P L Quote Quad, Vol. 12, No. 1, Sept. 1981. Oates, R . H . , Dyadic Execute, A P L Quote Quad, Vol. 14, No. 3, March 1984. Ivcrson, K.E., Introduction to APL, A P L Press, 1984. Iverson, K.E., A Dictionary OfAPL, I.P. Sharp Associates, 1986. (also A P L Quote Quad, %'ol. 18, Number 1, Sept. 1987, revised). I v e t ~ n , K.E., Applied Mathematics for Programmers, I.P. Sharp Associates, 1986. The American Heritage
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