i
M
q
r
Q
1
x
4
+
x
3
+
1
x
4
+
x
3
+
x
2
+
x
+
1
x
3
+
x
2
+
1
x
8
+
x
4
+
x
3
+
x
2
x
3
+
x
2
x
1
x
4
+
x
3
+
1