Uniqe record.

I have an input file like below.
source|target|dist
BNG|CHN|150
CHN|BNG|150
PUN|MUM|200
MUM|PUN|200
HYD|KOL|1700
KOL|HYD|1700
How can I get uniqe record.
source|target|dist
BNG|CHN|150
PUN|MUM|200
HYD|KOL|1700

 

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