Description Carlee needs a project for the science fair. She tries growing something in a jar, but she gets more than she bargained for. The phonemes /igh/ar/ 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').