https://moz.com/community/q/topic/28054/plural-vs-singular-keyword-usage-on-page-optimization
Plural vs singular keyword usage - on-page optimization | SEO Forum | Moz
The on-page report card appears to include both plural and singular versions of keywords in reporting the keywords within the body, which results in a keyword...
keyword usageoptimization seo
https://www.avanderlee.com/swift/required-keyword/
Required keyword usage in Swift classes and structs - SwiftLee
Feb 19, 2019 - A detailed explanation of the required keyword. The keyword is often misunderstood and is used within classes, with protocols and more.
keyword usagerequiredswift