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Fig. 17.
Echo's "world"
chromosomes: (1) condition for combat, (2) condition for trading, and (3) condition for mating. Conditions serve much as the condition parts of a classifier rule, determining what interactions will take place when agents encounter one another.
The fact that an agent's structure is completely defined by its chromosomes, which are just strings over the resource alphabet {a,b,c,d},plays a critical role in its reproduction. An agent reproduces when it "collects" enough letters to make copies of its chromosomes. As we will see, an agent can collect these letters through its

 
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