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|Trabb Pardo–Knuth algorithm
a : 11 0
i
if i LE 10
[] $s
~ $s w
w a.i
+ i
goif
endif
10 i
if i GE 0
call f
if x GT 400
'too large' $s
else
~ x $s
~ i $r
+ ' ' $r
+ $r $s.1
$s []
- i
stop
f a.i t
* t t x
* x t x
* 5 x
abs t
sqrt t y
+ y x
return