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[Linked Image from i.pinimg.com]

Byrne's unfinished cover for X-MEN 138, before the X-MEN logo and background montage of series covers were added.
Somehow the empty space in this version adds to the emotions portrayed, of isolation and distance Cyclops feels leaving the group.

For comparison, here's the final cover, and complete interior story :
https://viewcomiconline.com/uncanny-x-men-1963-issue-138/