Looking on the internet deeply has found these results:

it could be a coincidence is the most popular phrase on the web.

it could be coincidence 1293,000 results on the web	it could be a coincidence 1333,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Mr. Esterhase: It could be coincidence but... It could possibly be a coincidence. I mean, could it be coincidence? Or it could be a coincidence. I knew it couldn't be a coincidence. It was weird, yes, but it could be a coincidence. But after 25 years in a hospice working with people, many of whom were pronounced dead but then miraculously survived the account of what they actually experienced were so strikingly similar it couldn't just be coincidence. "It could be coincidence but..."	It could be just a coincidence, some random werewolf travelling through? IT COULD BE A COINCIDENCE, OR AN ANOMALY. I CAN'T BE SURE I knew it couldn't be a coincidence. Or it could be a coincidence. I knew that it couldn't be a coincidence, so I checked. It could just be a coincidence. It was weird, yes, but it could be a coincidence. It could possibly be a coincidence.

it could be coincidence

1293,000 results on the web

it could be a coincidence

1333,000 results on the web

More popular!

Mr. Esterhase: It could be coincidence but...
It could possibly be a coincidence.
I mean, could it be coincidence?
Or it could be a coincidence.
I knew it couldn't be a coincidence.
It was weird, yes, but it could be a coincidence.
But after 25 years in a hospice working with people, many of whom were pronounced dead but then miraculously survived the account of what they actually experienced were so strikingly similar it couldn't just be coincidence.
"It could be coincidence but..."