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ADS1298 ECG front end demostration kit: Augmented leads

Refer to page no 36 of the user guide , Derivation of Lead III is confusing me

LEAD I = LA – RA

LEAD II = LL – RA

LEAD III =  LL - RA - LA = LEAD II - LEAD I

I guess it should be LL - LA. Isn't that so ???