R-Controlled & Advanced Vowel Flashcards The R-Controlled Vowel Flashcards can be used for the daily Letter Naming activity, beginning in Week 19 of the primary curriculum. The Advanced Vowel flashcards can be introduced in Week 25 of the primary curriculum. This flashcard pack includes flashcards for the R-Controlled Vowels (ar, or, er, ir, ur) and Advanced Vowels (au, aw, ou, ow, oi, oy, oo) that are taught in the primary curriculum lessons. Reproduction of these flashcards for classroom use is permitted. Please Note: The clip art images included on the flashcards are used with permission from Microsoft. car orange ar or bird purple ir ur clover house er ou owl autumn leaves ow au yawn coins aw oi cowboy books oy oo rooster oo