Original sentence: A study of late eighteenth- and early nineteenth-century manuscripts shows that the s gradually came to be written over the p, developing into a close equivalent to the "$" mark.A variation, though less plausible, of this hypothesis derives the sign from a combination of the Greek character "psi" (ψ) and "S".The best documented explanation holds that the sign evolved out of the Spanish and Spanish American scribal abbreviation "pˢ" for pesos
Edited sentence: A study of late eighteenth- and early nineteenth-century manuscripts shows that the s gradually came to be written over the p developing a close equivalent to the "$" mark.A variation, though less plausible, of this hypothese derives the sign from a combination of the Greek character "psi" (ψ) and "S".The best documented explanation reveals that the sign evolved out of the Spanish and Spanish American scribal abbreviation "pˢ" for pesos