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%w(tree moss troll).permutation do |object, covering, resemblance| puts "a #{covering}-covered #{object} may look like a #{resemblance}" end a moss-covered tree may look like a troll a troll-covered tree may look like a moss a tree-covered moss may look like a troll a troll-covered moss may look like a tree a tree-covered troll may look like a moss a moss-covered troll may look like a tree