Is it "to top up by voucher" or "to top up with voucher"?
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A singular countable noun, such as "voucher", normally requires an article or other determiner. T he phrase "by ~", with certain nouns, in the sense of "using ~", is an idiomatic exception to this rule. Thus we can say "by voucher", "by train", "by computer" etc.
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A singular countable noun, such as "voucher", normally requires an article or other determiner. The phrase "by ~", with certain nouns, in the sense of "using ~", is an idiomatic exception to this rule. Thus we can say "by voucher", "by train", "by computer" etc. The same does not apply to "with ~". The ups