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.

course ‘course’

English

References: PH Hamm: I.1:5, 45:12; I.9:1, 51:6; I.11:4, 56:11
Translation of:
Greek: πάροδος [PH Heiberg: I.1:5, 72:2; I.9:1, 82:2; I.11:4, 90:29]