"Counting Code" 

[WTH THANKS TO EMILY SHORT]

Sherwood Forest is a room.
"You are in the forest with a matchbox and a quiver.".

A source is a kind of thing. A derivative is a kind of thing. A
derivative can be used or unused.

Derivation relates various things to one thing. The verb to be from
implies the derivation relation.

A bolt is a kind of derivative.
A match is a kind of derivative.

The plural of match is matches.
the plural of bolt is bolts. 

Some match collection is a source.
 It is in the matchbox. 
12 matches are from the match collection. 
Understand "match" or "matches" as the match collection. 
The printed name of match collection is "matches".

Some bolt collection is a source. It is in the quiver. 
12 bolts are from the bolt collection. 
Understand "bolt" or "bolts" as the bolt collection. 
The printed name of bolt collection is "bolts".

The player carries a matchbox and a quiver.
the matchbox is a closed,openable container.
understand "match box" or "box" as matchbox.

Instead of taking a source:
if an unused off-stage thing (called the item) are from the noun
begin;
move the item to the player;
   now item is used;
say "You pick up [an item].";
 if the number of unused off-stage things which are from the noun is 0, remove the noun from play;
end if.

Understand "count [something]" as counting. 
Understand "count [source]" as counting. 


Counting is an action applying to one thing.

Carry out counting:
if the noun is a source begin;
 let count be the number of unused off-stage things which are from the noun;
say "You see [count] of [the noun] left.";
 otherwise;
 say "There's just the one [noun]."; end if.