PAL

Ptolemaeus Arabus et Latinus

_ (the underscore) is the placeholder for exactly one character.
% (the percent sign) is the placeholder for no, one or more than one character.
%% (two percent signs) is the placeholder for no, one or more than one character, but not for blank space (so that a search ends at word boundaries).

At the beginning and at the end, these placeholders are superfluous.

الأصل ‘model’

Arabic. – Grammar: n..

References: PH Morelon: I.1:1, 15:4
Translation of:
Greek: ὑπόθεσις [PH Heiberg: I.1:1, 70:3; I.1:4, 70:20; I.2:4, 72:27]
Modern translations:
French: principes [PH Morelon: I.1:1, 14:7]
German: Grundlagen [PH Nix: I.1:1, 71:5]
Synonyms:
وضع[PH Morelon: I.1:4, 17:2; I.2:4, 17:20]