n=  50;
m=  50;
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AA=[   19,   12,   15,   15,   11,   12,   18,   17,   15,   20,   19,   19,   15,   14,   14,   13,   12,   14,   14,   11,   14,   18,   14,   12,   11,   15,   16,   11,   19,   15,   12,   14,   18,   11,   10,   13,   19,   13,   10,   18,   20,   10,   12,   18,   11,   18,   13,   10,   13,   10 ];
a=[
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];
c=[
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