help with truth tables?

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hello,
i ama attempting to read a character from a ps2 keyboard and output a corresponding morse code signal from an xs 95 board. i have the board reading the keystroke and shoeing character on a 7 segment display, i also have my square wave which i wish to output in either dot or dash form. my problem is finding a way to link the two so that when a button is pressed the corresponding waveform will be output on a pin? any help would be appreciated
 

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