Fig. 2
From: PangeBlocks: customized construction of pangenome graphs via maximal blocks
Two overlapping maximal blocks whose sets of rows are not nested. On the left, the (dashed line) block \((\{\bigcirc , \square , \bigtriangledown \},1,2)\), on the right the (solid line) block \((\{\square , \lozenge , \triangle \},2,9)\)