Barplots in R

Suppose I need to draw a Grouped bar plot with 100 values on the X axis. Now
my question is If I need to highlight suppose first three values by some
color say 'red' and also I need to highlight last 5 datavalues 
by some color say 'blue' and the rest of the data in between I need not
display. Is it possible? If yes How?
Could anyone explain

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