TASK DEFINITION: In this task the focus is on physical knowledge about the world. Given the provided goal task in the input, describe a process that would lead to the asked outcome. This process often involves physical motions with objects, such as moving them, arranging them in a certain way, mixing them, shaking them, etc. 
PROBLEM: Flushing the bottom of the stringer with ground.

SOLUTION: Draw a line parallel to the top of the last step notch, and perpendicular to the side of it (where the bottom riser will eventually go). Cut this away to make the bottom of the stringer flush with the ground. Now test the stringer by setting it in place. Cut the top and bottom of the stringer to fit, then test-fit it before cutting it out. Make sure the height is accurate. Both top and bottom points should be flush before fastening.

PROBLEM: To brighten clothes without using bleach.

SOLUTION: Add a pinch of salt to your load of laundry.

PROBLEM: smoke

SOLUTION:
can mark air with color