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So you compare the first 5 characters from the 2nd column.
The awk code in post#3 repeats the substr(), can be shortened p=s.
I think the following is better readable, too:
awk '(NR > 1 &&...

In addition to what Robin has already asked, one might note that there are no duplicate values in the second field in your sample input file. Is your real criteria for matching something like:

...

something along these lines if I undestand your input/output samples correctly:

awk '{s=substr($2,1,5)} FNR>1 && s!=p {printf ORS }{p=substr($2,1,5)}1' myFile