% SZS status Theorem for rextensi
% SZS output start Proof for rextensi
  file('i/f/set_relation/rextension',ch4s_setu_u_relations_rextension)).
  file('i/f/set_relation/rextension',ah4s_predu_u_sets_SPECIFICATION)).
  file('i/f/set_relation/rextension',ah4s_pairs_ABSu_u_PAIRu_u_THM)).
  file('i/f/set_relation/rextension',aHLu_EXT)).
% SZS output end Proof for rextensi
