Note 3 — Chapter XIII · [COMPOSED BY STERN.]
Alphonse Nahuys translation
Nos. 7 and 10, 10 and 13, 13 and 16, are connected by doors with each other; 9 and 12, 12 and 15, 15 and 18 are connected by doors with each other. Between 5 and 8 a door; between 17 and 20 a door; between 7 and 8, 10 and 11, 13 and 14, 16 and 17 doors; between 8 and 9, 11 and 12, 14 and 15, 17 and 18 doors. ↑