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Many sites hosting these types of files are heavy on pop-ups.

This likely represents a date—either February 4, 2020, or referring to when the subtitle file was created or when the media was first indexed. fsdss421 engsub020420 min hot

Short for "English Subtitles," indicating that the media has been translated from its original language. Many sites hosting these types of files are heavy on pop-ups

This is a standard product identifier (often called a "CID"). These codes are used by distributors to catalog specific titles in digital libraries. fsdss421 engsub020420 min hot

When searching for specific alphanumeric codes like this, you will often encounter "spammy" or unverified websites. It is highly recommended to: