When programming in Smalltalk, you sometimes need to
create new kinds of objects, and define what various
messages will do to these objects. In the next chapter we will
create some new classes, but first we need to understand how
Smalltalk organizes the types and objects it contains.
Because this is a pure "concept" chapter, without any actual
Smalltalk code to run, we will keep it short and to the
point.
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