I have decided to take the first answer received which was from kalahari. I agree with you (Rubbish Clue) Knowing my luck it will probablt be the other answer. A bit like 'Deal or No Deal'
Why not just put both answers? What I've done is to draw a diagonal line through the square, from top right to bottom left,, dividing it into half, and put "F" into one half and "T" into the other.