Join lines on finding a pattern

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1

I have a file with the following contents.

DTP
START
START
START
DTP
START
DTP
START
DTP
START

I like to join the lines like this

DTP START
    START
    START
DTP START
DTP START
DTP START
DTP START

My Shell is csh
2 
paste -sd' \n' file
3 
awk '{s=s?s" "$0:$0}
/START/{print s;s=""}' file