My first post and hope it is not a stupid one and related to this thread:

Can there be 4 whole numbers a, b, c, d all greater than zero such that:

a^2 + b^2 = c^2 and b^2 + c^2 = d^2?

If there are- can one give an example. If none can one prove it is not possible?

(Headbang)

ty in advance!(Clapping)