every/each/all

1) He can make a key to open every door in this building.

2) He can make a key to open each door in this building.

3) He can make a key to open all the doors in this building.

4) He can make a key that opens every door in this building.

5) He can make a key that opens each door in this building.

6) He can make a key that opens all doors in this building.

Which mean

a) one single key that opens all the doors

and which mean:

b) one key per door

Gratefully,

Navi