Can anyone please help me to find the right code using Python for these questions???

1-Note that the word 'instantaneous' has the letters 'tan' repeated once with no letters in between. That is 'tantan' appears in this word. How many words that have four letters that repeat once (with no letters in between)? Hint: You'll need a backreference: 2- Note that the word 'dressers' has the pattern 'resser' in it. That is, the three letters r-e-s reappear immediately after in reverse order, s-e-r. How many words total are there with this property