Write the following function in F#

// possiblewords: // Finds all Scrabble words in the Scrabble dictionary that can be // spelled with the given letters. The words are returned as a list // in alphabetical order // Example: letters "tca" returns the list // ["act" "at" "cat"; "ta"] let possibleWords letters- // possiblewords: // Finds all Scrabble words in the Scrabble dictionary that can be // spelled with the given letters. The words are returned as a list // in alphabetical order // Example: letters "tca" returns the list // ["act" "at" "cat"; "ta"] let possibleWords letters