코드
list1=[]
list2=[]
value=1
for i in range(0,3) :
for k in range(0,4) :
list1.append(value)
value +=1
list2.append(list1)
list1=[]
for i in range(0,3) :
for k in range(0,4) :
print("%3d" % list2[i][k], end="")
print("")
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