The next steps

Pseudo code: 
function myjoin(list, delimiter)
  joined = first element in list
  for element in rest of list:
    concatenate joined, delimiter and element
  return joined
Known examples: string concatenation (+ operator) from hw.py, list indexing (list[0]) from datatrans1.py, sublist extraction (list[1:]) from convert1.py, function construction from datatrans1.py

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