private static boolean isLower8BitRegister(final String register){
  return register.equals("al") || register.equals("bl") || register.equals("cl")|| register.equals("dl");
}

private static boolean isLower8BitRegister ( final String register ) { return register . equals ( "al" ) || register . equals ( "bl" ) || register . equals ( "cl" ) || register . equals ( "dl" ) ; }
determines whether a passed register is either al , bl , cl , or dl .
