IN_PIECE; (
  (CHOIX_CAFE;OUT_CAFE;RAMASSER;RECURSE)[]
  (ANNULATION;CHOIX_CHOCO;OUT_CHOCO;RAMASSER;RECURSE)[]
  (IN_PIECE; (
    (CHOIX_CHOCO;OUT_CHOCO;RAMASSER;RECURSE)[]
    (ANNULATION;OUT_PIECE;OUT_PIECE;RECURSE)
    )
  )
)