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Not with potato, but you can say:
"You can't get blood out of a stone"
or , "You can't get a turnip to bleed."
These phrases can be used to mean don't expect something that cannot render to render
examples:don't expect get money from a pauper,
don't expect brilliance from a dummy
etc.
By the way the blood -out-of- a- stone phrase is much more common than the turnip phrase.
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Me ayuda si corrige mis errores. Gracias.
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