My Life's Pattern

Looking at the years after I graduated in college, I could see a clear pattern.
In 2003 to 2005 I taught in a private school.
That's two years.
From 2005 to 2007 I was a seminarian.
That's two years.
From 2007 to 2009 I taught again in the same private school.
That's two years.
From 2009 to 2011 I taught in a public school.
That's again two years.
What a pattern!
I just realized it in 2011.