+ # --- Negative argument tests ---
+
+ 16 -12 4 -2 -3;
+ -16 12 4 2 3;
+ -12 -16 4 1 -1;
+ -12 16 4 1 1;
+ -693 609 21 181 206;
+ 693 -609 21 -181 -206;
+
+ # --- Zero argument tests ---
+
+ 15 0 15 1 0;
+ 0 15 15 0 1;
+ -5 0 5 -1 0;
+ 0 -5 5 0 -1;
+ 0 0 0 0 0;
+
+ # --- Random number tests ---
+