What do comma-like marks along a word mean?


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

[![comma-like
marks](https://i.stack.imgur.com/qhixv.jpg)](https://i.stack.imgur.com/qhixv.jpg)

**Update** : ah, seems to be duplicate of [What are these furigana (or
punctuation marks)?](https://japanese.stackexchange.com/questions/2768/what-
are-these-furigana-or-punctuation-marks) and [Do Japanese writers use
underline for emphasis?](https://japanese.stackexchange.com/questions/1735/do-
japanese-writers-use-underline-for-emphasis) Nevermind then, thanks!

