Logstash cycle in ruby filter

Hi, community. I have message in CEF format, that may have cs1...csn and cs1Label...csnLabel fields. I can't use CEF codec, because I want to keep my original message too. So I decided to use "for" loop in ruby filter and iterate over all this fields. But I don't know how to iterate over all this cs1...csn fields. Can someone help me?

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