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Hello,
According to Macmillian dictionary,

element in:
Advertising is not the only element in the marketing process .

element of:
Fieldwork is a key element of this course .

When do you use IN and OF? Or it is ok to use whatever you feel like using for anything?
Thanks.
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Hi,
Use element in if it is a necessary part in something; use element of if it is a necessary part of something.

Regards
Comments  
Thank you. That makes sense.