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jsn/a.cr

Created October 30, 2017 18:37
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a.cr
def check(l)
abba = false
l.scan(/([a-z])([a-z])\2\1/) do |rm|
next if $1 == $2
return false if rm.pre_match =~ /\[[^\]]*$/
abba = true
end
!!abba
end
puts STDIN.each_line.select { |l| check l }.size
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