Unit 1: Double Letters ee / ea
Unit 2: Double Letters oa / ow
Unit 3: Double Letters ai / ay
Unit 4: Double Letters oi / oy
Review 1: Double Letters ee ~ oy
Unit 5: Double Letters ow / ou
Unit 6: Double Letters ir / er / ur
Unit 7: Double Letters ar / or
Unit 8: Double Letters oo
Review 2: Double Letters ow ~ oo
Challenge: Double Letters ee ~ oo
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