keypad = {
    '2': ['A','B','C'],
    '3': ['D', 'E', 'F'],
    '4': ['G','H','I'],
    '5': ['J','K','L'],
    '6': ['M','N','O'],
    '7': ['P','Q','R','S'],
    '8': ['T','U','V'],
    '9': ['W','X','Y','Z']
}

words = []
numbers = [2,3,8]

# 2 => ['A','B','C']
# 3 => ['D','E','F'],
# 8 => ['T','U','V'],

# Take first number 2
# Get letters
# get first letter 'A'
# build all combinations with that by looping through each array of other 2 numbers
# A + DEF + TUV
# ADT
# AET
# BDT
# CDT
# AET
# AFT
# B

# for i in 0..numbers.length do
#     times = i + 1
    numbers.each_with_index do |number,index|
        letters = keypad[number.to_sym]
        letters.each do |letter|
            puts "NUMBER: #{number}, LETTER: #{letter}, INDEX. #{index}"
        end
        words[index] = ''
    end
# end
# words = []
# traverse(words, numbers)

# def traverse(number, numbers)
#     numbers.each_with_index do |number, index|
#         if index + 1 == numbers.length
#             @words << word
#         else
#             traverse(word, numbers)
#         end
#     end
#     word
# end


# def build_word(letter)

# end

#   def construct(expanded=false)

#       strategy.each do |f|
#         node = Node.new(f, formatter)
#         if expanded == true
#           @facets << node.traverse_all
#         else
#           @facets << node.traverse
#         end
#       end
#       @facets
#     end