s/vn_[a-z]*__\([a-z_]*\)\>/vn__\1/g
s/\<value_number__/vn__/g

s/hlds__is_builtin/is_builtin_/g
s/hlds__dependency_info/dependency_info_/g
s/unify_proc__info_/unify_proc_info__/g
s/transform__reschedule_conj/reschedule__conj/g
s/mercury_to_c__gen/c__gen/g