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The op/3 declarative is used to define operators, their position, and their proirity.
Operators are used during input and output of terms, purpose is to make terms easier to read and write.
| document: http://www.ifcomputer.co.jp/MINERVA/Manual/Reference/Directives/op/print_de.html published 2008/11/17 update 2002/3/20 (c) 1996-2006 IF Computer Japan | ||||||||
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