[hwxi@xanadu scm]$ scheme
Scheme Microcode Version 14.5
MIT Scheme running under GNU/Linux
Type `^C' (control-C) followed by `H' to obtain information about interrupts.
Scheme saved on Tuesday November 27, 2001 at 1:53:32 AM
  Release 7.6.0
  Microcode 14.5
  Runtime 14.192

1 ]=> (load "twentyfour.scm")

;Loading "twentyfour.scm" -- done
;Value: game-of-24

1 ]=> (game-of-24 3 3 8 8)
8/(3-8/3)
8/(3-8/3)
8/(3-8/3)
8/(3-8/3)
;Value: 1

1 ]=> (game-of-24 3 3 7 7)
(3/7+3)*7
(3/7+3)*7
(3+3/7)*7
(3+3/7)*7
;Value: 1

1 ]=> (game-of-24 10 10 4 4)
(10*10-4)/4
(10*10-4)/4
;Value: 1

1 ]=> (game-of-24 2 3 5 12)
12/(3-5/2)
;Value: 1

1 ]=> (game-of-24 1 5 5 5)
5*(5-1/5)
(5-1/5)*5
5*(5-1/5)
(5-1/5)*5
5*(5-1/5)
(5-1/5)*5
;Value: 1

1 ]=> (game-of-24 1 7 7 7)

;Value: 0

1 ]=> (game-of-24 1 7 7 10)
7/1+(7+10)
7/1+10+7
7/1+7+10
7+(7/1+10)
7+10+7/1
7+7/1+10
7+(7+10/1)
7+10/1+7
7+7+10/1
1*7+(7+10)
1*7+10+7
1*7+7+10
1*7+(7+10)
1*7+10+7
1*7+7+10
1*10+(7+7)
1*10+7+7
1*10+7+7
(1+7)*(10-7)
(1+7)*(10-7)
(1+7)*(10-7)
(1+7)*(10-7)
1*(7+7+10)
(7+7+10)/1
1*10+(7+7)
1*(7+7)+10
7+7+10/1
(7+7)/1+10
1*(7+10+7)
(7+10+7)/1
1*7+(7+10)
1*(7+10)+7
7+10+7/1
(7+10)/1+7
1*(7+(7+10))
(7+(7+10))/1
1*(7+10)+7
1*7+(7+10)
7+(7+10)/1
7/1+(7+10)
;Value: 1

1 ]=> (game-of-24 1 7 8 10)
(10-7)/(1/8)
8*(10-7/1)
8/1*(10-7)
8*(10/1-7)
8*(10-1*7)
1*8*(10-7)
(1*10-7)*8
8+10-(1-7)
8+(10-(1-7))
8-(1-7)+10
8-(1-7-10)
10-(1-7-8)
7+10-(1-8)
7+(10-(1-8))
7-(1-8)+10
7-(1-8-10)
10-(1-8-7)
7+8-(1-10)
7+(8-(1-10))
7-(1-10)+8
7-(1-10-8)
8-(1-10-7)
7-1+(8+10)
7-1+10+8
7-1+8+10
7+(8-1+10)
7+10+(8-1)
7+(8-1)+10
7+(8+(10-1))
7+(10-1)+8
7+8+(10-1)
1*(8*(10-7))
8*(10-7)/1
1*(10-7)*8
1*8*(10-7)
8*((10-7)/1)
8/1*(10-7)
8/(1/(10-7))
(10-7)/(1/8)
7+8+10-1
7+8+(10-1)
7+8-1+10
7+8-(1-10)
10-(1-(7+8))
7+10+8-1
7+10+(8-1)
7+10-1+8
7+10-(1-8)
8-(1-(7+10))
7+(8+10)-1
7+(8+10-1)
7-1+(8+10)
7-(1-(8+10))
8+10-(1-7)
;Value: 1

1 ]=> (game-of-24 1 7 8 9)
7/1+(8+9)
7/1+9+8
7/1+8+9
7+(8/1+9)
7+9+8/1
7+8/1+9
7+(8+9/1)
7+9/1+8
7+8+9/1
1*7+(8+9)
1*7+9+8
1*7+8+9
1*8+(7+9)
1*8+9+7
1*8+7+9
1*9+(7+8)
1*9+8+7
1*9+7+8
(1-7+9)*8
8*(9-(7-1))
(1-(7-9))*8
(1+(9-7))*8
(1+9-7)*8
1*(7+8+9)
(7+8+9)/1
1*9+(7+8)
1*(7+8)+9
7+8+9/1
(7+8)/1+9
1*(7+9+8)
(7+9+8)/1
1*8+(7+9)
1*(7+9)+8
7+9+8/1
(7+9)/1+8
1*(7+(8+9))
(7+(8+9))/1
1*(8+9)+7
1*7+(8+9)
7+(8+9)/1
7/1+(8+9)
;Value: 1

1 ]=> (game-of-24 2 7 8 9)
2*(7+9)-8
;Value: 1

1 ]=>