408   $ log '1 and parents(:2)'

   408   $ log '1 and parents(:2)'

   409   1

   409   1

   410   $ log '2 and children(1:)'

   410   $ log '2 and children(1:)'

   411   2

   411   2

   412   $ log 'roots(all()) or roots(all())'

   412   $ log 'roots(all()) or roots(all())'

   413   0

   415   0

   414   $ log 'heads(branch(é)) or heads(branch(é))'

   416   $ log 'heads(branch(é)) or heads(branch(é))'

   415   9

   417   9

   416   $ log 'ancestors(8) and (heads(branch("-a-b-c-")) or heads(branch(é)))'

   418   $ log 'ancestors(8) and (heads(branch("-a-b-c-")) or heads(branch(é)))'

   417   4

   419   4