Was there thinking involved? If not, then "I'm" could be in contention. The "And" being at the start of a sentence is also grammatically incorrect, as "and" is a conjunction.
So we're just down to "an", which is a conditional word on the next word beginning with certain letters, and the next word was found to be suspect at best, so it is also in debate by extension.
"I think, therefore I am."
Was there thinking involved? If not, then "I'm" could be in contention. The "And" being at the start of a sentence is also grammatically incorrect, as "and" is a conjunction.
So we're just down to "an", which is a conditional word on the next word beginning with certain letters, and the next word was found to be suspect at best, so it is also in debate by extension.