Double Sandpaper Letters
The 'phonograms' introduce the non-phonetic aspects of English. The Double Sandpaper Letters form the first stage of the Complete Reading Scheme (#0.055.00). Included in the set of 16 double letter combinations are: er, ee, ar, ou, oo, ai, or, ue, ie, au, oa, sh, ch, oy, th, qu. The Double Sandpaper Letters are on boards painted green.