Hi alL,
   I have a data frame with 4 columns: "value", "time",  "group" and "id".
   I would like to plot "value" vs. "time" with different colors for
different levels of "group" and
different symbols for different values of "id".
   I think I could do this but I would like to see what is an easier way to
plot
the data this way.
   Thank you vey much.
     Hanna

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