PMC:1624833 / 14708-15175 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/1624833","sourcedb":"PMC","sourceid":"1624833","source_url":"https://www.ncbi.nlm.nih.gov/pmc/1624833","text":"An example of a PQ-tree. An example of a PQ tree. Circles represent P nodes and rectangles represent Q nodes. Figure 3(a): Initial PQ tree T formed from set {a, b, c, d}. Figure 3(b): The PQ tree T after the REDUCE(T,{a, c}) operation, requiring that a and c be consecutive. Figure 3(c): The PQ tree T after the REDUCE(T,{b,c}) operation, requiring that b and c be consecutive. Valid permutations represented by this tree are the sequences acbd, bcad, dacb, and dbca.","tracks":[]}