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I think they do three packs with 2 serrated/tomato and one paring.
The Victorinox have a shallower angle than a lot of other knives, so might be why you can’t sharpen them?
I run the victorinox knifes through a Global ceramic roller sharpener and it gets them super sharp.
The little victorinox pen sharpener seems to do a decent job with the little knives for very little effort. Not very aggressive.
Victorinox Dual Knife Sharpener, Swiss Made, Portable, Black/Red https://www.amazon.co.uk/dp/B000AR7AKG/ref=cm_sw_r_cp_api_glt_fabc_73E2P8D7PDDMFTZWNHBZ?_encoding=UTF8&psc=1
What sharpener do you have?
Blade angles are different depending on different types.
If I was doing things again, I'd go for a santoku (or chinese cleaver if you get on with them), a good bread knife and a petty knife.
And a 3 pack of Victorinox paring knives for £15.