0	0	1	2
1	2	0	0
-
0	0	1	2
-
0	0	1	2
1	2	0	0
-
0	0	1	2
-
0
1
-
0
-
0
1
-
0
-
0
1
-
1
-
0
1
-
1
-
1	2	\N	\N
\N	\N	1	2
-
\N	\N	1	2
-
1	2	\N	\N
\N	\N	1	2
-
\N	\N	1	2
-
1
\N
-
\N
-
1
\N
-
\N
-
1
\N
-
1
-
1
\N
-
1
-