What is the difference between “k”, “ok”, “okkk” and "okay" especially when a girl replies to my text?

She used all of them on me but at different times. They did not make me feel different, I felt like they all sounded uninterested but I still have some hopes so I wanted to ask.

What is the difference between “k”, “ok”, “okkk” and "okay" especially when a girl replies to my text?
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