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What do comma-like marks along the word 捨て思い mean on book scan below?

comma-like marks

Update: ah, seems to be duplicate of What are these furigana (or punctuation marks)? and Do Japanese writers use underline for emphasis? Nevermind then, thanks!

marked as duplicate by naruto, Chocolate, macraf, Dono, broccoli forest Aug 10 '16 at 4:29

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