# list=[]
# i=0
# while i<10:
#     list.append(i)
#     i=i+1
# print(list)

# a=[1,2,3,4,5]
# b=[]
# b.append(a)
# print(b)

#
 
n=[[1,2,3,4],[5,6,7,8],[9,10,11,12]]
i=0
c=[]
while i<len(n):
    j=0
    while j<len(n[i]):
        c.append(n)
        print(n[i][j])
        j=j+1
    i=i+1
# k=0
# d=[]
# while k<len(n):
#     d.append(n)
#     print(n[i][j][k])
#     k=k+1

# a=[[1,2],[3,4],[5,6]]
# combin
# b=[]
# for i in range(len[a]):
#     b.append(a)
# # return(b)
# print(combine)