Question
Add the following :



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| $2$ | $4$ | $6$ | |||||
| $+$ | $6$ | $+$ | $1$ | $+$ | $2$ | ||
| $+$ | $1$ | $+$ | $9$ | $+$ | $7$ | ||
| $ $ |
$2 3$ | m | $ $ |
$2 8$ | m | $ $ |
$3 6$ | m |
| $+$ | $1 5$ | m | $+$ | $2 1$ | m | $+$ | $2 2$ | m |

| $ $ |
$1 2$ | $ $ |
$ $ |
$5 0$ | $ $ |
$ $ |
$3 8$ |
| $+$ | $1 5$ | $ $ |
$+$ | $2 3$ | $ $ |
$−$ | $1 2$ |
