Rangoli in python

def print_rangoli(size):
    width  = size*4-3
    string = ''

    for i in range(1,size+1):
        for j in range(0,i):
            string += chr(96+size-j)
            if len(string) < width :
                string += '-'
        for k in range(i-1,0,-1):    
            string += chr(97+size-k)
            if len(string) < width :
                string += '-'
        print(string.center(width,'-'))
        string = ''

    for i in range(size-1,0,-1):
        string = ''
        for j in range(0,i):
            string += chr(96+size-j)
            if len(string) < width :
                string += '-'
        for k in range(i-1,0,-1):
            string += chr(97+size-k)
            if len(string) < width :
                string += '-'
        print(string.center(width,'-'))
        

print_rangoli(10)


------------------j------------------
----------------j-i-j----------------
--------------j-i-h-i-j--------------
------------j-i-h-g-h-i-j------------
----------j-i-h-g-f-g-h-i-j----------
--------j-i-h-g-f-e-f-g-h-i-j--------
------j-i-h-g-f-e-d-e-f-g-h-i-j------
----j-i-h-g-f-e-d-c-d-e-f-g-h-i-j----
--j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j--
j-i-h-g-f-e-d-c-b-a-b-c-d-e-f-g-h-i-j
--j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j--
----j-i-h-g-f-e-d-c-d-e-f-g-h-i-j----
------j-i-h-g-f-e-d-e-f-g-h-i-j------
--------j-i-h-g-f-e-f-g-h-i-j--------
----------j-i-h-g-f-g-h-i-j----------
------------j-i-h-g-h-i-j------------
--------------j-i-h-i-j--------------
----------------j-i-j----------------
------------------j------------------

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