functionali
identity equals is less_than greater_than less_than_eq greater_than_eq complement is_even is_odd is_divisible is_divisible_by is_numeric is_atom contains is_empty is_nested all_predicates some_predicates
identity
equals
less_than
greater_than
less_than_eq
greater_than_eq
complement
is_even
is_odd
is_divisible
is_divisible_by
is_numeric
is_atom
contains
is_empty
is_nested
all_predicates
some_predicates