2000-01-14 paulson 2000-01-14 still working; a bit of polishing
2000-01-13 paulson 2000-01-13 working version, with Alloc now working on the same state space as the whole system. Partial removal of ELT.
1999-12-22 paulson 1999-12-22 Working version after a FAILED attempt to base Follows upon LeadsETo
1999-06-10 paulson 1999-06-10 shortened Follows to Fols
1999-05-24 paulson 1999-05-24 Theory of the "Follows" relation