Ibn Ezra on Genesis 13:9/אבן עזרא על בראשית י״ג:ט׳

1THEN I WILL GO TO THE RIGHT. Ve-e’minah (I will go to the right) comes from the same root as yamin (right).

2[THEN I WILL GO TO THE LEFT.] The alef of the noun semol (left) is enunciated in the verb ve-asme’ilah (then I will go to the left). Now this alef is missing in the word hasmili (direct thyself to the left) in Go thee one way to the right, or direct thyself to the left (Ezek. 21:21). Thus, we cannnot determine whether the alef is part of the root of semol or not.