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One of the methods for defining translations is the so called syntax-directed translation scheme which can be interpreted as a pair of rather similar grammars with the productions working in parallel. Because of the similarity of the grammars each of the two grammars "fits" the other in the sense that for each derivation process in one grammar leading to a terminal word the corresponding derivation process in the other grammar also leads to a terminal word. For many practical applications itdoi:10.1016/s0019-9958(76)90341-7 fatcat:gp3msjpstjdcbchkjp6f5qvuay