At 7:45 time stamp

#1

Sir is talking about (i,i+J). I did not get this.

#2

@premang
around 7:45 sir is explaining that if our top left corner of submatrix is (i,j) then bottom right corner of submatrix should not be less than (i,j)

that is if (bi,bj) is bottom right corner of submatrix then
i <=bi and j <= bj

#3

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