Description An owl has stolen Mai's coin. She and Ren go to the forest to get it back, but the owl isn't all they find there. The phonemes /ow/oi/ are featured in this title. In Level 4 - Blue 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').