This is as close as I could get... the 'S' is obviously edited and maybe even from another font, the 'P' might not exactly match but it's your decision weather you'll use this version or wait longer for the others to find something that's more convincing than my submission, or maybe the exact font... the rest is up to you....
As Pusheen already put, the 's' comes from somewhere else.
And maybe also there is your 's', backslanted a bit.
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