CALCUĀCO at the peak of the house / encima de la casa, azotea, techo, tejado (Z) [(2)Zp.50,143]. The expected form would be CALCUĀC. See CAL-LI, CUA(I)-TL, -C(O). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 21.