First we should notice that Ab5-23 is one of a pair, with the other one coming earlier in the text:

Ab3-13	Ab3-14	Ab3-15	Ab3-16	Ab3-17	Ab3-18	Ab3-19

Ab5-21	Ab5-22	Ab5-23	Ab5-24	Ab5-25	Ab5-26

Then we can compare with the parallels in H, P, and Q (where the corresponding twin tahana glyphs are close to each other):

Ha3-38	Ha3-39	Ha3-40	Ha3-41	Ha3-42	Ha3-43
Ha3-44	Ha3-45	Ha3-46	Ha3-47	Ha3-48

Pa3-29	Pa3-30	Pa3-31	Pa3-32	Pa3-33	Pa3-34
Pa3-35	Pa3-36	Pa3-37	Pa3-38	Pa3-39

Qa3-25	Qa3-26	Qa3-27	Qa3-28	Qa3-29	Qa3-30
Qa3-31	Qa3-32	Qa3-33	Qa3-34	Qa3-35