Your search for the postposition -ááłk’iis alongside, parallel with has returned 2 entries

-ááłk’iis

Shí t’óó ’ááłk’iis yisháałgo shizhé’é tsékooh gódeg ha’asbą́ą́z.

1 merely SUP alongside 1-go.Prog-GO 1-father canyon areal-up up-3-drive.P
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My father drove (a wagon) up out of the canyon with me walking alongside. (YM 1987:2)