✐‹creator "Kevin Kappelmann"› section ‹States› theory Zippy_States imports ML_State ML_Morphs begin ML_file‹zippy_ctxt_state_mixin_base.ML› ML_file‹zippy_ctxt_state_mixin.ML› ML_file‹zippy_state_mixin_base.ML› ML_file‹zippy_state_mixin.ML› end