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Probably it will be a matrix 5x5. 5 lines 5 columns.
I think that is a custom job.
With the help of a multimeter you can see which pins a lines and columns
fist you find the row and coloum connections of the keyboard . here i attatch a image that contain abasic diagram of a 4 by 4 matrix keyboad.. In that image (a,b,c,d) are thecoloum lines and (1 2 3 4 ) are the row connections . the keys are in the green colour.. if you look in your key boad you can find lines like this.If you find lines then you can easily program that keyboad..
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