28. (a)
R S Theta Phi E F
.5 .5 0 0 0 0
.5 .5 0 0 .5 0
.333 .333 0 0 0 .667

(b)
R S Theta Phi E F
.5 .5 0 0 0 0
.5 .5 0 0 .5 0
.5 .5 90 90 1 .5

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