Force or friction against the bottom of your foot causes the skin to thicken, forming a callus.
(Force or friction against the bottom of your foot; causes; the skin to thicken) Context(Force or friction against the bottom of your foot causes,List([0, 56))):(Force or friction against the bottom of your foot; causes the skin to thicken forming; a callus)
Force or friction against the bottom of your foot causes,List([0, 56))
Force or friction against the bottom of your foot Force or friction against the bottom of your foot
causes causes the skin to thicken forming
the skin to thicken
a callus