**
Volume 17 (2006), Issue No. 1-2**

Foreword

E. Barcucci, A. Bernini and M. Poneti:
From Fibonacci to Catalan permutations

J.-L.Baril and P.-T. Do:
ECO-generation of *p*-generalized Fibonacci and Lucas permutations

A. Bernini, I. Fanti and E. Grazzini :
An exhaustive generation algorithm for Catalan objects and others

M. Bouvel and D. Rossin:
The Longest Common Pattern Problem for two Permutations

E. Duchi, R. Mantaci, H.D. Phan and D. Rossin :
Bidimensional sand pile and ice pile models

A. Frosini and S. Rinaldi:
An object grammar for the class of *L*-convex polyominoes

E. Grazzini, E. Munarini, M. Poneti and S. Rinaldi:
*m*-compositions and *m* partitions: exhaustive generation and Gray code

S. Heubach, S. Kitaev and T. Mansour:
Avoidance of partially ordered patterns in compositions

J. Korsh and S, Lipschutz:
Gray code and loopless algorithm for the reflection group *D*_{n}

P. Massazza and R. Radicioni:
A symbolic approach to computing with holonomic functions

F. Rakotondrajao:
*k*-fixed points permutations

M. Weston and V. Vajnovszki:
Gray codes for necklaces and Lyndon words of arbitrary base