How can Nama-rupa of Dependent Arising be same as Five Aggregates?

It is generally told that the 4th entry in the chain of Dependent Origination, namely Nama-rupa is nothing but the Five Aggregates (Nama being the sum of Vedana, Sanna, Sankhara and Vinnana). But three of the Aggregates separately appear in the chain of Dependent Origination : Sankhara (2nd entry), Vinnana (3rd entry) and Vedana (7th entry). So there occur three repetitions if Nama-rupa is identical with Five Aggregates. How can this be explained?