Hello all,

I have a data frame filled with senders and recipients. Some of the senders
have multiple rows with different recipients and I want to merge those
rows. For example I have

a@email.com     b@email.com
a@email.com     c@email.com     d@email.com
r@email.com      f@email.com
r@email.com      h@email.com

I want this to become

a@email.com     b@email.com     c@email.com     d@email.com
r@email.com      f@email.com      h@email.com

How would I go about doing this?

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