edgs=[['A','0000'],
['A','0010'],
['A','0011'],
['A','0101'],
['A','0110'],
['A','0111'],
['A','1000'],
['A','1001'],
['B','0000'],
['B','0001'],
['B','0010'],
['B','0011'],
['B','0100'],
['B','0111'],
['B','1000'],
['B','1001'],
['C','0000'],
['C','0001'],
['C','0011'],
['C','0100'],
['C','0101'],
['C','0110'],
['C','0111'],
['C','1000'],
['C','1001'],
['D','0000'],
['D','0010'],
['D','0011'],
['D','0101'],
['D','0110'],
['D','1000'],
['D','1001'],
['E','0000'],
['E','0010'],
['E','0110'],
['E','1000'],
['F','0000'],
['F','0100'],
['F','0101'],
['F','0110'],
['F','1000'],
['F','1001'],
['G','0010'],
['G','0011'],
['G','0100'],
['G','0101'],
['G','0110'],
['G','1000'],
['G','1001']]