Your are allowed to turn over simultaneously 4 cards that either:

a.)all 4 are consecutive,

or

b.) 2 are on the left and 2 on the right of any specific card chosen by you (i.e. out of 5 consecutive cards only the middle one remains unturned) .

By executing a final number of the above (a. or b.) procedures can you reach an **"all face-up" **state?

If yes, explain how.

Otherwise, prove why not.