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class Integer
# Check whether the integer is evenly divisible by the argument.
def multiple_of?(number)
self % number == 0
end
# Is the integer a multiple of 2?
def even?
multiple_of? 2
end if RUBY_VERSION < '1.9'
# Is the integer not a multiple of 2?
def odd?
!even?
end if RUBY_VERSION < '1.9'
end
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