valuemeaningexpression_to_actionatom_to_action_constbuild 'primitive'_identifierlookup_in_tablelookup_in_entrylookup_in_entry_helplist_to_aciton_quote_lambdabuild 'non-primitive'_condevcon_applicationapplyevlisapply_primitiveapply_closureis_atom ?trueIs Primitive ?trueno Number or Boolfalsenot foundfalseis_else ?trueanswer_offalsemeaning question_of ?trueanswer_offalsearg1function_ofarg2argumentsis_primitive ?trueis_non_primitive