v=spf1 include:spf.protection.outlook.com include:yyy.com ip4:188.8.131.52 -all
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Do note that there is a limit on the DNS resolutions you can have in the record, and the one used by EOP already has 4 lookups, so excessive "include" clauses will invalidate the SPF. So I would advise you to not add all of these unless you are absolutely sure they are necessary, and there is no option to use other workarounds (such as using a separate domain for sending messages via happifox, etc).
You can use this tool to validate the SPF once you've added all the clauses: https://www.kitterman.com/spf/validate.html