c b a e f d trzd vkekn vkekn ykd ykd apdh ykd * apdh wob rua atsv euew ykd apdh psnoq atsv psnoq ecz rua clj gex * ykd clj ykd psnoq pry euew wob * ecz gex gex pry pry clj ykd atsv gex psnoq trzd zxgktr rua rua pry trzd clj wob atsv gex ecz * zxgktr pry atsv wob ecz ecz wob clj pry vkekn ykd apdh trzd trzd * rua gex ykd psnoq vkekn wob atsv juzex apdh euew apdh rua zxgktr gex * euew trzd juzex zxgktr rua apdh juzex → gex juzex apdh apdh clj apdh wob * vkekn zxgktr euew gex apdh apdh trzd * wob gex juzex trzd vkekn wob vkekn