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made executable again
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2011-08-07 Ferruccio Guidi- cpr is now defined and the cpr_flat propery is proved...
2011-08-06 Ferruccio Guidi- transitivity of parallel telescopic substitution...
2011-07-27 Ferruccio Guidi- xoa: bug fix and improvement
2011-07-17 Ferruccio Guidimore lemmas and some generated logical constants for...
2011-06-18 Ferruccio Guidi- xoa: more existential types
2011-06-14 Ferruccio Guidisome restructuring