clc
clear
disp("ck")

a=[3 7 -4 12; -5 9 10 2; 6 13 8 11; 15 5 4 1]
b=a(:,2:4)
c=a(2:4,:)
d=a(1:2,2:4)
max_3rd_row=max(a(3,:))
min_last_col=min(a(:,4))

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