10
10
=
1
+
9
10
=
4
+
6
10
=
+
10
=
+
10
=
+
10
=
+
7
7
=
1
+
7
=
+
4
7
=
+
7
=
+
7
=
+
10
101010101010
7
77777
10
101010101010
7
77777