a new moon is a kind of phase of the moon
new_moon is phase_of_moon. phase_of_moon is not phase. moon has not phases full_moon is not phase_of_moon. half_moon is not phase_of_moon. full_moon is phase_of_moon. moon has phases half_moon is phase_of_moon. phase_of_moon is phase. new_moon is not phase_of_moon.