Data selection
IfErrors
A graph
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+
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H
D
W
M
Y
!
A graph
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D
W
M
Y
!
A graph
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H
D
W
M
Y
!
IfOctets
A graph
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W
M
Y
!
A graph
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W
M
Y
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A graph
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M
Y
!
IfPackets
A graph
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→
H
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W
M
Y
!
A graph
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H
D
W
M
Y
!
A graph
←
-
+
→
H
D
W
M
Y
!