0	1	a	a
0	8	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
1	2	b	b
1	6	a	a
1	7	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
2	3	a	a
2	5	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
3	4	b	b
3	4	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
4
5	4	b	b
6	3	b	b
6	5	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
7	3	b	b
7	5	a	a
7	5	@_IDENTITY_SYMBOL_@	@_IDENTITY_SYMBOL_@
8	9	b	b
8	6	a	a
9	3	a	a
