Fleck vs Flecken what is diff?
Google translate show same translate for both - and they are not plural.

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thank you mach! it is very clear now. and additional thanks for ref

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Fleck -> singular // Flecken -> 1. plural -> but sometimes people use Flecken also as a singular form. It's not proper grammar but spoken. Try Duden.de => that's "the" source for germans to verify questions about german words and language (it's the standard reference). Рака