For every three tables below, the first two should have borders between some cells, but not the third:

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

For every three tables below, the first two should have borders on some edges, but not the third:

X

X

X

X

X

X

X

X

X

X

X

X