Father, Mother, Minji and younger brother went to take pictures. Mother says she will take pictures with the younger brother on her back. How many different ways are there to take pictures side by side?
[OP_LIST_SOL] Father Mother Minji [OP_LIST_EOL] [OP_LIST_LEN] [OP_LIST_LEN] [OP_PERM]
var_a = 'Father'
var_b = 'Mother'
var_c = 'Minji'
list_a= []
if "/" in str(var_c):
    var_c = eval(str(var_c))
list_a.append(var_c)
if "/" in str(var_b):
    var_b = eval(str(var_b))
list_a.append(var_b)
if "/" in str(var_a):
    var_a = eval(str(var_a))
list_a.append(var_a)
list_a.reverse()
var_d = len(list_a)
var_e = len(list_a)
var_f = 1
var_d = int(var_d)
var_e = int(var_e)
for i, elem in enumerate(range(var_e)):
    var_f = var_f * (var_d-i)
print(int(var_f))