Find number of tree in canvas which has own chain but not mixed with other tree

@SanjaiRamesh wrote:

I am using horizontal, vertical and grid layout… I have requirement to find number of tree…
Ex:-

A–>B–>E–>K
H–>E
C–>E

M–>L–>N–>Y
R–>L

Z–>G

Now we can say 3 tree are available, how we can find tree which own chain not mixed with other tree…

Any suggestions please…

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