anchor.diff:  
   %% API
   -export([start_link/5,
  -         prepare/2,
  -         deleting/2]).
  +         block_deleted/2]).
   
   %% gen_fsm callbacks
   -export([init/1,
  +         prepare/2,
  +         deleting/2,
            handle_event/3,
            handle_sync_event/4,
            handle_info/3,
  
positive.code:                 uuid :: binary(),
                  manifest :: lfs_manifest(),
                  riakc_pid :: pid(),
                  delete_blocks_remaining :: ordsets:ordset(integer()),
                  unacked_deletes=ordsets:new(),
                  mani_pid :: pid(),
  
negative.code: %% Internal functions
  %% ====================================================================
  
  maybe_delete_block(State=#state{bucket=Bucket,
                                  key=Key,
                                  uuid=UUID,
  