atomic alphabet is determined by the electron alphabet of an eve
oghamic_letter is letter_of_alphabet. rune is letter_of_alphabet. alphabet has all_letters executable_arithmetic_operation is atomic_statement. abstract_atomic_symbol is ais. roman_letter is letter_of_alphabet. roman_alphabet is alphabet. roman_alphabet is not alphabet. roman_letter is not letter_of_alphabet. alphabet is series_of_letters.