Maybe like others you have four different type of credit cards like visa , master and ...

about mixing up with passwords you`ll change all in a same one (one password for all cards) but what about that: you have to carry all cards with you

I think we can produce a card that has four cards in it :

in each face we have two EMV chip in each side(left and right).and about magnetic stripe,one in up and other in down of a face.and other face like this.

What do you think ;)

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