mismatch of keyboard keys after booting onto LFS

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http://www.linuxquestions.org – Hello guys. i just completed the LFS 7.4 and successfully booted in and got log in in it. but when i check the keyboard some keys have been mismatched for example:- if i press "z" then "y" is presented on screen and similarly if "y" is pressed then "z". i am facing this problem with many keys ? -> - (numpad) . -> , can any one please help me out (HowTos)