Unless I'm misunderstanding the rules of the game...
#1 the 'E', 'T' have already been chosen.
#2 the 'C', 'T' have already been chosen.
#3 the 'T' has already been chosen.
#4 the 'S', 'E' have already been discarded.
#6 the 'U' has already been chosen.
#8 the 'O' has already been chosen.
#9 the...