A computer implemented method, a computer system, and a program for generating a parser combination. The method includes: generating a parser combination by combining parsers each associated with at least one grammar description, where the step is carried out using (i) at least one grammar description means and (ii) a computer device. The computer system includes: a processor, a memory connected to the processor, and a parser generator for generating a parser combination in the memory by combining parsers each associated with at least one grammar description, and at least one grammar description type means.
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