Generate alternating-hand words for easy typing. Dictionary: https://github.com/dwyl/english-words. ruby alt.rb < ~/Downloads/words.txt > alternating.txt; gshuf -n 50 < alternating.txt

alt.rb

KEYS_ON_LEFT_HAND = 'qwertasdfgzxcv'

def alternating?(iterable)
  return true if iterable.count < 2
  return false if !!iterable[0] == !!iterable[1]
  alternating? iterable.drop 1
end

def key_on_left_hand(word)
  word.downcase.chars.map { |l| KEYS_ON_LEFT_HAND.include? l }
end

def alternating_word?(word)
  alternating? key_on_left_hand word
end

def long_enough?(word)
  word.chars.count >= 7
end

$stdin.each_line do |word|
  puts word if long_enough?(word) && alternating_word?(word)
end