"ךּ" is rare but exists, e.g. last word in Deuteronômio 7 1 (דברים פרק ז׳ פסוק א׳) in the word "מִמֶּךָּ" – see תנ״ך מנוקד, דברים פרק ז׳. There is a single occurrence of "ףּ", see this comment[D].
omniglot.com
«Abjads». Omniglot. Consultado em 19 de Janeiro de 2012
