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∆     #....#    ∆∆∆
∆∆    #....#    ∆∆∆
∆∆    #....#    ∆∆∆
∆∆∆   #....#     ∆ 
∆∆    #....#   ∆∆∆ 
 ∆    #....#   ∆∆  
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