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    on 2.5.0:

    /usr/local/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- mathn (LoadError)
	from /usr/local/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
	from main.rb:4:in `solve'
	from main.rb:10:in `block in <main>'
	from /runner/frameworks/ruby/cw-2.rb:55:in `block in describe'
	from /runner/frameworks/ruby/cw-2.rb:46:in `measure'
	from /runner/frameworks/ruby/cw-2.rb:51:in `describe'
	from main.rb:9:in `<main>'