hard 9×9 Set 4 Table Grid
7-4=8=2=33x3/
3-1-6
11+9=2=6=4-7=7/
4/13+8=24+5
5=6=3=7/
6=8=1=15x13+1-3=
1=5=17+9=28x
168x1=924x4=5=5
9=7-6=3-12=
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