The Feet

• the North foot of F:

PN = {nf, nf+1, ... , nl }

• the South foot of F:

PS = {sf, sf+1, ... , sl }

• the West foot of F:

PW = {wf, wf+1, ... , wl}

• the East foot of F:

PE = {ef, ef+1, ... , el }

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