anchor.diff:  start_watch(Dest) ->ng.
   stop_watch(Dest) ->ng.
   
  -
   %% prepare blackboard
   start_blackboard(BBName) -> ng.
   clear_blackboard(BBName) -> ng.
  
positive.code:     PrefList = riak_core_apl:get_primary_apl(DocIdx, 1, rc),
      [{IndexNode, _Type}] = PrefList,
  	riak_core_vnode_master:sync_command(IndexNode, {lookup, Name}, rc_vnode_master).
  
negative.code:     PrefList = riak_core_apl:get_primary_apl(DocIdx, 1, rc),
      [{IndexNode, _Type}] = PrefList,
      riak_core_vnode_master:sync_spawn_command(IndexNode, ping, rc_vnode_master).
  
  get_state(Name) ->
      DocIdx = riak_core_util:chash_key({<<"character">>, list_to_binary(Name)}),
  