Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 125

Black to play. How can they live?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[bq][bp][cn][dn][bm][cl][fl][fn]
AW[bo][cp][co][dp][fp][go][hp][gq][gr]
C[Black to play
How can they live?
]
(;B[ao]
TE[1]C[Correct answer
];W[an];B[ap];W[bn];B[cq];W[dq]
(;B[bs];W[cr];B[br];W[dr];B[ar])
(;B[dr]
BM[1]C[Wrong continuation
];W[er];B[cs];W[ar];B[br];W[es];B[ds];W[bs]))
(;B[cq]
BM[1]C[Wrong answer
];W[ap];B[dq];W[eq];B[er];W[br];B[aq];W[cr];B[dr]
;W[es];B[ao];W[an];B[bn])
(;B[dr]
BM[1]C[Wrong answer
];W[cq];B[cr];W[br];B[ar];W[bs];B[cs];W[ap];B[as]
;W[eq];B[er];W[es]))

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