# list0702.rb

require 'thread'

puts 'hello'
t = Thread::fork{
   puts 'sk1'
   sleep(1.0)
   puts 'sk2'
   sleep(1.0)
   puts 'sk3'
   sleep(1.0)
   puts 'end ko thread'
}
puts 'sn1'
sleep(1.0)
puts 'sn2'
t.join
puts 'world'