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Awk Array Loop translation

While working on a HP UX storage migration project, I found an awk statement as following

ioscan -funNCdisk | \
awk '{a[NR]=$0} $0~s {f[NR]++} END {for (j=1;j<=NR;j++) if (f[j]) for (i=j+C;i<=j+C;i++) \
print a[i]}' C=1 s="NetApp"

It appears it prints out the lines that match "NetApp" and some more lines related to that keyword.

Could anyone tell me to understand what this statement means?

Thank you