#!/usr/bin/env python3
from functools import *
import json

with open("tweets.json", "r") as tweet_db:
    tweets = json.load(tweet_db)

# TODO: implement assigned functions


def flatten(xs):
    return list(reduce(lambda res, x: res + (flatten(x) if isinstance(x, list) else [x]), xs, []))

#def difference(xs, ys)

#def to_text(tweets)

#def to_lowercase(tweets)

#def nonempty(tweets)

#def total_word_count(tweets)

#def hashtags(tweet)

#def mentions(tweet)