What's the best way to screed over paving slabs to get a smooth surfac

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We've built on a small sunroom extension to our bungalow The "floor" is the existing paving slabs which are not too even What would be the best and cheapest way of levelling It enough to cover with carpeting? Doesn't need to be perfect but practical!
q what s the best way to screed over paving slabs to get a smooth surfac
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