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goto_name. control word is used in 明確 定義
(:),and goes to
matching label_name. .
se control words are included to facilitate modelling
of certain processes.
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f=: 3 : 0 if. y. do. goto_true. else. goto_false. end. label_true. 'true' return. label_false. 'false' return. ) f 0 false f 1 true f '' true