Go (Baduk, Weiqi) problems with solutions

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Tsumego: get a ko 007

7 Black to play

How to start a ko fight?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qa][qb][pb][ob][oc][ia][ib][jb][kb][kc][ma]
AW[ra][rb][qc][pc][rd][od][nd][md][ld][kd][jc][ic][hb][ha][gc]
[mb]
C[7
Black to play
How to start a ko fight?]
;B[mc]
TE[1]C[Correct answer]
;W[na];B[nb];W[la];B[lb];W[lc];B[ma]LB[ma:7][lc:6][lb:5][la:4][nb:3][na:2][mc:1]
)

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