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The P options are for controlling the patterns to be considered by Pratt. See also the F options for controlling flexibility.Option PL:
Allows you to set the maximum length of a pattern. The length of the pattern C-x(2,4)-[DE] is 1+4+1=6. The memory requirement of Pratt depends on L; a higher L value gives higher memory requirement.Option PN:
Using this you can set the maximum number of symbols in a pattern. The pattern C-x(2,4)-[DE] has 2 symbols (C and [DE]). When PN is increased, Pratt will require more memory.Option PX:
Using this option you can set the maximum length of a wildcard. Examples of wildcards and lengths arex - 1Increasing PX will increase the time used by Pratt, and also slightly the memory required.
x(10) - 10
x(3,4) - 4