Write a PYTHON program to do this

A bigram is a sequence of two adjacent letters in a string. For example, the phrase "this may be" contains the following bigrams: th, hi, is, ma, ay, be.

1. Process the plain text filewells.txt by removing the non-alphabetic symbols and lowercasing all letters.

2. Extract the 10 most-frequent bigrams and their counts from the processed text.

3. Identify the English words in the file wordlist.txt that contain all of the 4 most frequent bigrams.