i: Math
t:  +
   1 2 + 3 try
t:  -
   2 1 - 1 try
t:  /mod
   10 3 /mod 3 try 1 try
t:  *
   4 4 * 16 try
t:  negate
   1 negate -1 try
  -1 negate 1 try
t:  /
  10 3 / 3 try
t:  mod
  10 3 mod 1 try
t:  */
  100 200 3 */ 6600 try
