sunchen115

ss=%w{JP OYJC欧阳继超 FJ冯佳 SC孙晨}.sort
pairs=[]
ss.each do |e1|
  ss.each do |e2|
    if e1 != e2
      pairs<<[e1,e2].sort unless pairs.include?([e1,e2].sort)
    end
  end
end