Question
How are microbes used to Treat Sewage?
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| Column $A$ | Column $B$ | ||
| $1$ | Koji | $a$ | Yeast |
| $2$ | Gari | $b$ | Japan |
| $3$ | Temph | $c$ | Fermentation |
| $4$ | Vinegar | $d$ | Indonesia |
| $5$ | Baking | $e$ | Africa |