preferred_name: One foot falls to the support surface, but knee remains off the support surface. The other foot and leg remain off the support surface.
preferred_name_lc: one foot falls to the support surface, but knee remains off the support surface. the other foot and leg remain off the support surface.
label: One foot falls to the support surface, but knee remains off the support surface. The other foot and leg remain off the support surface.
label_lc: one foot falls to the support surface, but knee remains off the support surface. the other foot and leg remain off the support surface.