Scrabble has been corrupted.
How? All these two letter 'words' are valid:
aa ab ad ae ag ah ai al am an ar as at aw ax ay ba be bi bo by ch da de di do ea ed ee ef eh el em en er es et ex fa fe fy gi go gu ha he hi hm ho id if in io is it ja jo ka ki ko ky la li lo ma me mi mm mo mu my na ne no nu ny ob od oe of oh oi om on oo op or os ou ow ox oy pa pe pi po qi re sh si so st ta te ti to ug uh um un up ur us ut we wo xi xu ya ye yo yu za zo
Source: Appendix:Official English Scrabble 2-letter words - Wiktionary
Let's start with 'aa' - aa - Wiktionary - seriously?
Boycott Scrabble today! Wake up sheeple!