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This is not in Scrabble so I don't know your stance on this, but I'll suggest anyway.
Would it be possible to have vowels and consonants have their bar marked in different colours?
This would facilitate the formation of words, but might make the game a bit easier.
I'm only somewhat following Scrabble for the word list, as that's a reputable source for it.
What do you mean by "bar"? Like the outline of the card?
Yes, outline is what I mean.