أن نفرض من المعلول الأخير إلى غير النهاية جملة، وما قبله مثلا إلى غير النهاية جملة أخرى
Assume one collection from the last effect back without end, and another starting from its predecessor back without end.
The first list includes the last or present effect; the second begins one member farther back among earlier causes. It is thus treated as shorter by one member in the classical construction.
Schematic ordering:
First collection: A, B, C, D, …
Second collection: B, C, D, …
These letters only illustrate the setup. The target of the argument is a series of actual existents, not merely a written sequence of symbols.