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You can do it easily with 3 umpires per field. Say 3 fields, 9 umpires:
1: Plate1, Base1, Off, Plate2, Base2, Off, Plate3, Base3, Off, repeat and stir.
2: B1, Off, P2, B2, same rotation...
3: Off, P2, B2, off, etc.
4: P2, B2, Off, P3, etc.
5: B2, Off, P3, B3, etc... you get the point.
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