## Congressus Numerantium, Volumes 140-141 |

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### Contents

The CliqueWidth of Unit Interval Graphs is Unbounded | 5 |

Quadrangular Cayley Graphs Embedded on the Torus by Linda Valdes | 19 |

Cycle Free Probe Interval Graphs by Li Sheng | 33 |

Copyright | |

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3-D mesh adjacent algorithm assume basic blocks BTSR Cayley graph central vertex clique clique-width column complete graph Computer Congressus Numerantium connected graph consider construct contains contradiction covariant defined denote destination diam(G eccentric vertex edge-deleted edge-graceful edge-graceful labeling edge-magic elements of frequency embedding example exists faulty cube G is eccentric geodetic number geodetic set graph G Graph Theory halfcycles Hamilton cycle Hamilton path Hence hexagonal implies induced subgraph integer intersects join k-tour knight's tour labeling least Lemma Let G Lotto design lower bound Mathematics maximal independent sets mensuration canon metric middle two levels minimal path multicast node number of basic number of leaves O-array obtain pair partition pendant edge peripheral appendage number permutation graph probe interval graph Proof rad(G result spanning tree subsets supervaluation Suppose symmetry Theorem traffic steps triangular honeycomb upper bound vertex set vertices of G