A owns five adjoining tracts of forest land, numbered 1 through 5. All five lots had previously been owned by O as a single tract; A purchased each lot from O in a separate transaction, lot 1 first, lot 2 second, lot 3 third, lot 4 fourth, and finally lot 5. Lots 1 and 2 are bounded by a public road on the north. Lots 3 and 4 are bounded by a public road on the south. Lot 5 has no access to a public road, except through one of the other 4 lots.