Parameterized Suffix Trees
Motivation: find duplication in software systems
pfi->min_bounds.lbearing,
pfi->max_bounds.rbearing);
http://cm.bell-labs.com/cm/cs/who/bsb/index.html
Parameterized Duplications in Strings: Algorithms and an Application to Sotware Maintenance
Siam J. Computing, October 1997.