In the order:  a, b, c. 
  0, 5, 10
  20, 25, 30
 fun2(20) returns: 32
 fun2(25) returns: 37
 fun2(30) returns: 42
 fun2(20) returns: 32
  20, 25, 30
  10, 4, 10
  5, 1, 10
  1, 0, 10

Switch order:  b, c, a. 
  0, 10, 1