The "permuters" module is an easy to use permutation algorithm.
The algorithm can be applied to solve any sort of permutation problem.
Application to "queens" and "pyramid" are provided.
Includes E sources.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  636    1660  38.3% -lh5- ec3a May 16  2004 Modules/smartlib/permuters.e
[generic]                  777    1426  54.5% -lh5- dbe4 May 16  2004 Modules/smartlib/permuters.m
[generic]                 1883    3324  56.6% -lh5- 09c0 May 16  2004 pyramid
[generic]                 1797    3144  57.2% -lh5- 58ee May 16  2004 queens
[generic]                  881    1784  49.4% -lh5- df31 May 16  2004 pyramid.e
[generic]                  756    1397  54.1% -lh5- 29ac May 16  2004 queens.e
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         6 files    6730   12735  52.8%            May 16  2004