346 Answers
yt (^5) 2t
0 5 10
1£^5 21,
(SXg)-iS" ,.,.c, "
~^1 + 1.+-1+1t-i -+-
-r !( '+'-t-(.,
i-t-S
,3-3 S (1'1. t)4-1t1t
'I
Ii-X4-)+ Ij.t Ij.t~ qtqi'<1tqtq '2
- 1.. +"J.. 1"'2.
..,. -1L q
I+T~
larger square shows how this may be done. All the conditions of the puzzle are
thus complied with, and the maximum ten directions obtained.
[The squares using 4,7 and 8 are needlessly complex. Victor Meally suggests:
4 + 4 _ 4 = 7V2
4+4
7+7+7+7_10
7 -
8 - 8! 8 = 7lh..
-M.O.]