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fro n t view
i s t m m m i i m i m m i m i m m n i m i t m i ยป
cross-section
i-f-T T T -f-f f f-f-T -T -f-f T T -f-T-f
f-T-f-T T T -T f-T -f-f f - f - T f f f T f - f - T f t T -f-f f
Ar
