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extra-keys = [\
['ESC','!','@','#','%','^','&','*','()','BACKSLASH','DEL'],\
['PGUP','PGDN','{}','<','>','[]',':','/','"','PGDN','PGUP'],\
['SHIFT','.','-',"'",'$','_',',','HOME','UP','END','BKSP'],\
['CTRL','ALT','TAB','`','~','|',';','LEFT','DOWN','RIGHT','ENTER']\
]