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You arrange for basic arithmetic calculations using the +, -,
*, and / messages for
addition,
subtraction,
multiplication, and
division:
6 + 3 <-- Add 3, answering 9 6 - 3 <-- Subtract 3, answering 3 6 * 3 <-- Multiply by 3, answering 18 6 / 3 <-- Divide by 3, answering 2