classmate	us		intl		=	pc+us(classmate-intl)
  classmate	us		alt-intl	=	pc+us(classmate-alt-intl)
  classmate	us		altgr-intl	=	pc+us(classmate-altgr-intl)
  nokiarx51	cz		qwerty		=	nokia_vndr/rx-51(cz_qwerty)