It's a grammatical error stemming from a misinterpretation of the phrase in spoken language, where the words "a part" and "apart" may sound similar.
People often confuse "apart" with "a part" because they sound nearly identical when spoken but have different meanings. "Apart" means separated by a distance, whereas "a part" means to belong to or be included in something.
The correct expression is "be a part of," which means to be included in or belong to a group or activity.
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