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Both the and: and or: methods take blocks as arguments:
receiver expression and: argument block receiver expression or: argument block
If the receiver of an and: message is false, the argument
block is ignored, and the value of the expression is false.
If the receiver of an or: message is true, the argument
block is ignored, and the value of the expression is true.
Thus, for the and: message, the argument block is evaluated only if
the receiver is true, and the value of the expression is the value
of the block. For the or: message, the argument block is evaluated
only if the receiver is false, and the value of the expression is
the value of the block.