Chapter One - "Beneath the Privy"
Beneath the Privy is a special_sewer_room. It is lighted. It is down from the Privy. The printed name is "Beneath the Privy". The description is "It's dark and smelly down here. The sewer, with about a foot of filthy water in the lowest part, stretches east. It slopes slightly down to the west, and the water sluggishly flows in that direction and down through a small drain. High above, a faint light trickles down from the privy in your peristyle. Rusted iron rungs lead up to the privy's seat."
A sewer_rat is an animal in Beneath the Privy. The description is "A brown sewer rat flinches away from the light." The printed name is "sewer rat". The indefinite article is "a". Understand "brown", "sewer" and "rat" as the sewer_rat. Instead of doing anything other than examining with the sewer_rat, say "The rat scurries into the shadows."
The small drain is scenery in Beneath the Privy. The description is "The sewer's flow vanishes here down into a nine-inch drain pipe." Understand "pipe", "drainpipe", "nine", "inch", "inches", and "nine-inch" as the small drain. The small drain can be enterable. The small drain is enterable. Instead of entering the small drain, say "You'd never fit." Instead of going down in Beneath the Privy, try entering the small drain. Instead of going west in Beneath the Privy, try entering the small drain.
The privy_ceiling is a sky_scenery in Beneath the Privy. The description is "Dark stone, caked with slime, looms overhead. Iron rungs lead up to the seat of the privy in your peristyle." The printed name of privy_ceiling is "tunnel ceiling". Understand "ceiling", "stone", "dark", "caked", "slime", and "overhead" as the privy_ceiling.