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| Item-$I$ | Item-$II$ |
|---|---|
| $a$. Natural rubber | $I$. $1,3-$butadiene $+$ styrene |
| $b$. Neoprene | $II$. $1,3-$butadiene $+$ acrylonitrile |
| $c$. Buna$-N$ | $III$. Chloroprene |
| $d$. Buna$-S$ | $IV$. Isoprene |
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