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- conserva la quantitat -> si no es dóna, vol dir que entèn que una distribució diferents es una quantitat diferent.
-coneix la seqüència numèrica
- sap enumerar una col·lecció -> diferenciar, reconéixer i triar elements, memoritzar la tria, diferenciar els triats dels no triats, seleccionar un element no triat després del triat i saber que s'han triat tots.