U-shapes (any direction)

Panchimal (MH878v)

Yaopitza (MH877v)

Mizyaotl (MH871v)

Yaopain (MH871r)

Chimalli Xochitl (MH870v)

Yayauhquitlalpan (Mdz51r)

nenetl (MH829v)

nenetl (MH733v)

Quetzalpoyoma (MH827r)

Tlailotlacan (X.040.B.27)