Goal and options: When do you take the samples from the plants you want to graft?
output answer: Take them from the plant during the dormant season to ensure that they are internally as concentrated as possible and closed to prevent damage from the parasitic portion.

Goal and options: How to paint keys.
output answer: Paint keys with nail polish and nail polish brush. Let dry on newspaper.

Goal and options: marker
output answer:
can be used in school