perl - How to modify a single separator in between the text -

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hello: looking modify 1 separator in between following text either awk, perl or sed

a,b,c,d,e,f,g,,,,k,l,m

to output 

a,b,c,d,e-f,g,,,,k,l,m

how modify nth separator ? in advance

you can use sed,

sed 's/,/-/5' yourfile

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