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NB. Very inefficent wrt memory and somewhat inefficent wrt speed,
NB. but no need to optimize on a modern machine.
...
echo #solns1

NB. end

ggrypp
ypgrrr
ryppyg
prygyr
1

   <"2 solns
+------+------+------+------+------+------+------+------+
...
|yrppgy|yppryg|prypyg|ppyrgy|ryppyg|rppygy|pyrpgy|ppryyg|
|rpgyry|rygpyr|gpryyr|gyrpry|prygyr|pgyrry|yrpgry|ygpryr|
+------+------+------+------+------+------+------+------+

   ,/"2,"1&' ' |:"2 (1 3 0 2){"1 solns
gyrp rgpy gpyr yrpg 
...
yrpg gpyr gyrp rgpy 
gpyr yrpg rgpy gyrp 
yrpg gpyr rgpy gyrp