If you feel this is
a service to you, I recommend that you make a contribution to
WikiMedia
Foundation. While you are prompted to donate a minimum
of twenty dollars, you can make lesser donations of ten
dollars. (Any less and the costs of processing eat up any
benefit of the donation.) I think a donation of ten dollars is
certainly appropriate and a gigantic savings to you. If
you benefitted from this and want others to benefit as well, I
hope you will choose to donate as part of the community of
learners and scholars.