co_symbol = "<1>","<2>","<3>","<4>","<5>","<6>","<7>","<8>",
            "<9>","<10>","<11>","<12>","<13>","<14>","<15>"
symbol = "~","!","%","^","*","(",")","-","+","=","[",
        "]","\\",":",";",",",".","/","?","&","<",">","\|"