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>> RUBY_VERSION
=> "1.8.6"

SyntaxError: compile error
(irb):3: syntax error, unexpected kNOT, expecting ')'
puts( not(1 == 1))
^
(irb):3: syntax error, unexpected ')', expecting $end
from (irb):3

SyntaxError: compile error
(irb):1: syntax error, unexpected kNOT, expecting $end
puts not(1 == 1)
^
from (irb):1

>> puts (not(1 == 1))
false
=> nil
>> puts( not(1 == 1))

>> puts not(1 == 1)

puts (not(1 == 1) )

puts( not(1 == 1) )