(;AB[sq]AB[rq]AB[rp]AB[qp]AB[pp]AB[op]AB[nq]AB[nr]AB[ns]AB[np]AW[os]AW[or]AW[oq]AW[pq]AW[qq]AW[rr]AW[sr]LB[ln:0]LB[mn:1]LB[nn:2]LB[on:3]LB[pn:4]LB[qn:5]LB[rn:6]C[How many ko threats are there?FORCE]AP[goproblems]
(;B[ln])
(;B[mn])
(;B[nn])
(;B[on];W[om]C[Prove it.FORCE]
(;B[qr];W[qs]C[FORCE]
(;B[pr];W[ps]C[FORCE]
(;B[qr];W[rs]C[RIGHT])
(;B[rs];W[qr]C[RIGHT])
(;B[pr])
(;B[ss]))
(;B[ps];W[pr])
(;B[rs];W[pr])
(;B[ss];W[pr]))
(;B[qs];W[qr])
(;B[rs];W[qr])
(;B[ps];W[qr])
(;B[pr];W[qr])
(;B[ss];W[qr]))
(;B[pn])
(;B[qn])
(;B[rn]))