__________
     |\                \
     |  \                \
     |    \________\
     |    |              |     
     |    |              |     Before
     |    |  (●)     (●)  |  
     \    |    \___/    |  
       \  |     \/     |  
         \|              |  
           ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄ ̄


      / ̄ ̄ ̄ ̄ ̄ ̄\
    /             \
   /                  ヽ 
    l:::::::::.                  | 
    |::::::::::   (●)     (●)   |       After
   |:::::::::::::::::   \___/     |  
    ヽ:::::::::::::::::::.  \/     ノ