rhsTail = new Each( rhsTail, new Identity() );
Map<String, Tap> sources = createHashMap();
sources.put( "lower", new NonTap( new Fields( "offset", "line" ) ) );
sources.put( "upper1", new NonTap( new Fields( "offset", "line" ) ) );
sources.put( "upper2", new NonTap( new Fields( "offset", "line" ) ) );
Map<String, Tap> sinks = createHashMap();
sinks.put( lhsTail.getName(), new NonTap( new Fields( "offset", "line" ) ) );
sinks.put( rhsTail.getName(), new NonTap( new Fields( "offset", "line" ) ) );
initialize( sources, sinks, lhsTail, rhsTail );
}