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Fair enough, John, although I wasn't asking for what evidence Shakespeare gave us, I was asking for personal opinion of how to play it. Were Regan and Goneril close sisters, united against their common enemy (Cordelia), who then parted ways, possibly directly due to the influence of Edmund? Or was it always every girl for herself? This would go directly toward the early scenes in the play - are they a team, or is Goneril the leader who tells her sister every move to make, leaving Regan as the frustrated younger one waiting for her opportunity to seize control? How would you direct it?