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Messages can include arguments as well as method selectors.
In the following expression, for example, the message consists of a method
selector, raisedTo:, and an argument, 10:
2 raisedTo: 10
Note that the colon is part of the raisedTo: method selector; the
colon is there to indicate that an argument is expected. Note also that
the T is in uppercase, in accordance with the Smalltalk method
naming conventions explained in Segment••missing reference••.