exercises.rb

def count_letters(sentence)
  
end

# count_letters("hello hi")
#=> {'h'=> 2, "e"=> 1, "l"=> 2, "o" => 1, " "=> 1, "i"=> 1}


def has_2?(collection, element)

end

# has_2?(["a", "b", "x", "a"], "a") #=> true
# has_2?(["a", "b", "x", "a"], "x") #=> false


def has_n?(collection, element, n)

end

# has_n?(["a", "b", "x", "a"], "a", 2) #=> true
# has_n?(["a", "b", "x", "a"], "a", 3) #=> false