Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
The differences visible in the square alphabets are much more apparent.
In the Aramaic and Hebrew square alphabet, resh is a rounded single stroke while dalet is a right-angle of two strokes.
The pro-active rationale at the time, as OPtion was approaching the end of the squared alphabet, was to eliminate repeating the original OP alphabet yet again, and thus avoid cubed letters.
It is rather later than that of Abb and his wife, since the Aramaic characters are transitional from the archaic to the square alphabet; see Driver, /Notes on the Hebrew Text of the Books of Samuel/, pp.