... CONSUMER of waste paper, a draln is a CONSUMER of liquids, and a mailbox ts a CONSUMER of mail. Some objects are both SOURCEs and CONSUMERS. A pipe is a CONSUMER of tobacco and a SOURCE of ... an open window. These sets of descriptions form a small set of "states" which the object may Oe in, each state corresponding to a set of inferences and asSociations approriate ... different types of caps (corks, twist-off, ), and which method is appropriate For which cap. However, For the purpose of understanding a text which does not re/er to a specific type of bottle,...