Write the following function in F#

/ wordswithScores // Finds all Scrabble words in the Scrabble dictionary that can be // spelled with the given letters. The words are then "scored" // based on the value of each letter, and the results returned as // a list of tuples in the form (word, score). The list is ordered // in descending order by score; if 2 words have the same score, // they are ordered in alphabetical order // Example: letters "tca" returns the list / [("act",5); ("cat",5); ("at" ,2); ("ta",2)] let wordsWithScores letters - / wordswithScores // Finds all Scrabble words in the Scrabble dictionary that can be // spelled with the given letters. The words are then "scored" // based on the value of each letter, and the results returned as // a list of tuples in the form (word, score). The list is ordered // in descending order by score; if 2 words have the same score, // they are ordered in alphabetical order // Example: letters "tca" returns the list / [("act",5); ("cat",5); ("at" ,2); ("ta",2)] let wordsWithScores letters