r = {
    "shrimp" => [
        "algae",
        "other_shrimps",
        "seaweed",
    ],
    "toad" => [
        "children",
        "flies",
    ],
    "lion" => [
        "donut",
        "tourists",
        "children",
    ],
}

def largest_hash_key(hash)
  hash.max_by{|k,v| v}[0]
end

def most_common_prey(animals_hash)
    food_counts = {}
    animals_hash.each do |animal, foods|
        foods.each do |food|
            if !food_counts.has_key? food
                food_counts[food] = 0
            end
            food_counts[food] += 1
        end
    end
    largest_hash_key(food_counts)
end

puts "Most common prey: #{most_common_prey(r)}"


def rhymes?(word1, word2, num_letters)

    (1..num_letters).each do |letter_index|
        if word1.chars[-letter_index] != word2.chars[-letter_index]
            return false
        end
    end

    return true
end

word1 = "murat"
word2 = "meercat"


puts "Do #{word1} and #{word2} rhyme? #{rhymes?(word1, word2, 100)}"