Scrabble - 2 letter words

After many (boot)Lego's and video games, my kid ask for a game of Scrabble, yep a "bored" (board) game, but somehow one need to get away from the usual once a while and think in peace for a moment. Only now I knows there're so many two letters words can be formed and valid, some I don't even know what it means.
OK is Not OK to be used in Scrabble, but KO is OK (get it?!).

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