def frequency(string)
    keys = {}
    keys.default = 0
    for letter in string.split('') do
        keys[letter] = keys[letter] + 1
    end
    return keys
end

def is_anagram(first, second)
    return frequency(first) == frequency(second)
end

def is_unique(line)
    words = line.split(' ')
    for i in 0..words.length - 1 do
        word = words[i]
        for j in (i+1)..words.length - 1 do
            if is_anagram(word, words[j]) then return false end
        end
    end
    return true
end

contents = File.open("puzzle_4.txt", "rb").read
lines = contents.split("\n")
puts lines.select {|line| is_unique(line)}.length