a
:=
0
2
-
5
0
4
6
0
0
-
1
b
:=
6
6
3
-
2
0
4
7
5
0
0
-
3
2
0
0
0
2
c
:=
2
0
0
0
4
0
0
0
9
a
:=
0
2
-
5
0
4
6
0
0
-
1
b
:=
6
6
3
-
2
0
4
7
5
0
0
-
3
2
0
0
0
2
c
:=
2
0
0
0
4
0
0
0
9
Det
[
a
]
Det
[
a
]
0
Det
[
b
]
Det
[
b
]
-
144
-
144
Det
[
c
]
Det
[
c
]
72