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a2b:={[1]->[2]};
a2a:={[i]->[i]};
b2b2:={[i]->[i+1]};
b2c3:={[i]->[i]};
c2c:={[i]->[i]};
reachable of a in (a,b,c) {
a->b:a2b, b->c:b2c3, a->a:a2a, b->b:b2b2, c->c:c2c,
a:{[1]}
};
reachable of b in (a,b,c) {
a->b:a2b, b->c:b2c3, a->a:a2a, a:{[1]}, b->b:b2b2, c->c:c2c
};
cr := reachable of c in (a,b,c) {
a:{[1]},a->b:a2b, b->c:b2c3, a->a:a2a,
b->b:b2b2, c->c:c2c };
cr;
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