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/ parsing
(f;r;t):+{x[1 4],,9_x^'","}'" "\' 0:"input"
(f;t):`s$''(f;t)
r:f!{`I$x[&(x<58)&47<x]}' r
g:f!t
/ total flow scoring
tf: {+/+\{x,(30-#x)#0}((r.)'x)*`XX=':x}
/ valves to open
vto: f^(=r).0;
/ paths to keep after each step
best: {x[(1000&#x)#>tf'x]}
p:{[n;ps]
ms:ps[&~fin:(#vto)={#?x[&`X=':x]}'ps];
rt: best[ps[&fin],(ms[w],'(,*|)'ms[w:&{(0|/vto=l)&~|/0&':x=l:*|x}'ms]),,/{x,/:,'g[*|x]}' ms];
$[n>1;o[n-1;rt];rt]}
*tf'p[29;,,`AA]
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