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Trying making a bet with 〜てみる

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ご注文はうさぎですか? » Volume 1 » Page 104

Chiya and Chino prepare to play a game of chess.

千夜(ちや):
「せっかくだし(なに)()てみない?」
“Since we have the chance, want to try betting something?”
Literal: “Since we have the chance, won't we try betting something?”
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