[EM] Big typo!

[MIKE OSSIPOFF]

I mistakenly said that defensive burying is needed in Approval and Margins.

I meant that defensive burial is needed in IRV & Margins (also in 
Plurality).

Defensive burying of a favorite is never needed in Approval.

Order-revesal can only be needed in Approval under conditions that are said 
to be so unlikely that they can be ignored.

And, to repeat, Approval never gives anyone incentive to vote anyone over 
their favorite.

IRV, Plurality, and Margins often require that.

Mike Ossipoff

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