Go (Baduk, Weiqi) problems with solutions

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Endgame (yose) tesuji problem 021

Black to play. How can Black close off the upper side in sente?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[13]
ST[2]
AB[lb][lc][ld][ke][kf][jg][jh][hh][gh][fg][ge][gd][hd][hc][ic]
[ed]
AW[he][hf][hg][je][jf][id][kd][jc][kc][kb][ib][la]
C[How can Black close off the upper side in sente?]
;B[ja];W[ka];B[hb];W[ia];B[ha];W[jb]TE[1])

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