Hi folks programmers,
Today we are going to solve a problem of how to convert a list of string to pair of strings

Input
['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']

Expected Output
A
AB, AC, AD, AE, AF, AG, AH, AI
ABC, ABD, ABE, ABF, ABG, ABH, ABI
ABCD, ABCE, ABCF, ABCG, ABCH, ABCI
ABCDE, ABCDF, ABCDG, ABCDH, ABCDI
ABCDEF, ABCDEG, ABCDEH, ABCDEI
ABCDEFG, ABCDEFH, ABCDEFI
ABCDEFGH, ABCDEFGI
ABCDEFGHI

So here now we will start our coding in python programming.
We have to use nested for loops because we need to iterate over a single list.

For now I am not going to measure any kind of run time or space complexities. So let's get started

mylst = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I']

current_val = ""
count = 0

for i in range(len(mylst)):
  if i == 0:
    print(mylst[i])
  current_val = current_val + mylst[count]
  count += 1
  for j in mylst[i+1:]:
    if current_val == j:
      print(j)
    else:
      if mylst.index(j) == len(mylst) - 1:
        print(current_val + j, end=' ')
      else:
        print(current_val + j, end=', ')
  print('')

I hope you would love this solution of the program and will surely give me a like.

Thanks for your valuable time.

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