Go (Baduk, Weiqi) problems with solutions

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Tsumego: capture the stones 078

78 Black to play

How can Black kill the white group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[lb][kb][hb][ic][jc][mc][nc][ma][od][ne][pd][qc][rc][sd][re]
AW[sc][rb][qb][pb][pc][oc][mb][nb][jb][ib][kc][lc]
C[78
Black to play
How can Black kill the white group?]
;B[na]
TE[1]C[Correct answer]
;W[ob];B[ka];W[sb];B[ra]
(;W[qa]
C[See the variation]
;B[oa]LB[oa:7][qa:6][ra:5][sb:4][ka:3][ob:2][na:1]
)
(;W[oa];B[qa]LB[qa:7][oa:6][ra:5][sb:4][ka:3][ob:2][na:1]
))

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