<human>: Goal: How to separate a piece of paper into 2 equal pieces, cleanly, without scissors?

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- To separate a piece of paper into 2 equal pieces, cleanly, place a saw in the middle of the paper and pull the paper up against the edge of the ruler to separate it into two pieces.
- To separate a piece of paper into 2 equal pieces, cleanly, place a ruler in the middle of the paper and pull the paper up against the edge of the ruler to separate it into two pieces.
<bot>: To separate a piece of paper into 2 equal pieces, cleanly, place a ruler in the middle of the paper and pull the paper up against the edge of the ruler to separate it into two pieces.