arr1 = [
    [[1,2,3],[4,5,6]],
    [[7,8,9],[9,8,7]],
    [[6,5,4],[3,2,1]]
]

# arr2 = [[[16,18,13],[19,18,12],[11,14,16]],
#         [[26,28,23],[29,28,22],[21,24,26]]]


result = [elem for val1,val2 in arr1 for elem in zip(val1,val2)]
for i in result:
    print(i)

# Coded by Saahil