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/// @file
#include "jets/q.h"
#include "jets/w.h"
#include "noun.h"
u3_noun
u3qb_roll(u3_noun a,
u3_noun b)
{
u3_noun pro = u3k(u3x_at(u3x_sam_3, b));
if ( u3_nul != a ) {
u3j_site sit_u;
u3_noun i, t;
u3j_gate_prep(&sit_u, u3k(b));
u3k(a);
do {
i = u3h(a);
pro = u3j_gate_slam(&sit_u, u3nc(u3k(i), pro));
t = u3k(u3t(a));
u3z(a), a = t;
} while ( u3_nul != a );
u3j_gate_lose(&sit_u);
}
return pro;
}
u3_noun
u3wb_roll(u3_noun cor)
{
u3_noun a, b;
if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
return u3m_bail(c3__exit);
} else {
return u3qb_roll(a, b);
}
}
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