nl: ESCAPE_MAPPINGS is an dictionary with 10 initial entries: None for 'A', None for 'b', None for 'B', '0' for 'd', 'x' for 'D',
code: ESCAPE_MAPPINGS = { "A" : None , "b" : None , "B" : None , "d" : "0" , "D" : "x" , "s" : " " , "S" : "x" , "w" : "x" , "W" : "!" , "Z" : None , }