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I have finished without parsing them all, and thanks to someone below for explaining 'persevere'!

My other issue is

'unfinished matter raised in controlled language'

r?s?i?n
surely must be Russian but why???
Thanks!

RAN + ISSU(e) (Rev.)

The unfinished matter is issu(e), raised is reversed.
Controlled is ran
Giving Russian for language.

Thanks for that! I went through russian backwards a couple of times and just couldnt see the issu!

I know the feeling, Izzy!