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Pack interval -- prolog/rint.pl
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Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 interval(Arg1, Arg2)
 interval(Arg1, Arg2, Arg3)
 r_initialize
 r(Arg1)
 r(Arg1, Arg2)
 r_source(Arg1, Arg2)