How can one detect if one is using more than one steem account?

How can one detect if one is using more than one steem account?

i noticed it is a bit difficult to have more than one account but can do so when ready to pay for it.
The questions is “is there a way of knowing if another steemian is using two steem account?

• Yes please state how

• No i don't know if there is way of knowing.

• No way of knowing

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