Description Fang . Is Seth's new dog too gentle to be called Fang? Quick! Run! Ned is asleep, but somebody has made a big mess. Who could it be? The phoneme /oo/ is featured in this title. In Level 3 - Yellow books, children build on the letter-sound combinations learned in levels 1 and 2. They learn consonant digraphs (sounds made up of two letters together such as 'ch' or "ll") and long vowel sounds (such as 'igh' or 'ai').