A pupil thinks of a word containing a known phonogram, which is
communicated to the teacher. The child standing before the class then
says, "I am thinking of a word belonging to the "an" family." The word,
we will say, is "fan." A child who is called on asks, "Is it c an?" The
first child replies, "It is not can." Another asks, "Is it m an?" etc.,
until the correct word is discovered.