Fig. 3
From: PangeBlocks: customized construction of pangenome graphs via maximal blocks
Two overlapping maximal blocks with nested sets of rows. Starting from the left, we have the (solid line) block \((\{\square , \lozenge , \triangle \},2,9)\) and the (dashed line) block \((\{\bigcirc , \square , \lozenge , \triangle , \bigtriangledown \},7,8)\). The second (dashed line) block is a vertical block because it contains all rows of the MSA