One problem is the complex series of rules governing what can be labelled as «natural vanilla». (economist.com)
Divorce involves an intricate series of rules — and many of them come with deadlines. (info.legalzoom.com)
In order to get the authority and ranking benefits from a backlink, you must adhere to a strict and often ambiguous series of rules and guidelines that Google implemented through its Penguin algorithm updates. (audiencebloom.com)