In [28]:

    

# Python program to print all permutations with
# duplicates allowed
 
def toString(List):
    return ''.join(List)
 
# Function to print permutations of string
# This function takes three parameters:
# 1. String
# 2. Starting index of the string
# 3. Ending index of the string.
def permute(a, l, r):
    if l==r:
        print (toString(a))
    else:
        for i in range(l,r+1):
            a[l], a[i] = a[i], a[l]
            permute(a, l+1, r)
            a[l], a[i] = a[i], a[l] # backtrack
 
# Driver program to test the above function
string = "ABCD"
n = len(string)
a = list(string)
permute(a, 0, n-1)
 
# This code is contributed by Bhavya Jain


    

    




ABCD
ABDC
ACBD
ACDB
ADCB
ADBC
BACD
BADC
BCAD
BCDA
BDCA
BDAC
CBAD
CBDA
CABD
CADB
CDAB
CDBA
DBCA
DBAC
DCBA
DCAB
DACB
DABC

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ABC

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