Marijn "i before j" van Putten 30 Apr 18
Replying to @PhDniX
Where in Dutton's sample, the baseline (= u) form was consistently written with a yellow colour, while the subscript (=i) was written with red; He concluded that those were working together to denote bi-hī, fī-hī and ʿalay-hī; Forms attested in, e.g. ibn Kaṯīr's reading.