I've noticed the following sets of words that seem to have a very obvious pattern, and, of course, their meanings are very closely related:
- これ、 それ、 あれ、 どれ
- この、 その、 あの、 どの
- ここ、 そこ、 あそこ、 どこ
What are the origins of these sets of words? I'm asking them all together because I'm thinking that their origin is interrelated.