Chef And Unusual Pests

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Chef is a farmer who owns a farm of $N$X$M$ yards. His production yield was going well, suddenly his production yield dropped drastically due to some unknown factors. Chef was tensed, he wanted to know the reason of this drastic drop in production yield. So he examined his farm and found out that the reason for this drastic drop was pests. After examining the pests he found some unusual kind of

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