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(unless ...) vs (when (not ...))

From: Hongyi Zhao
Subject: (unless ...) vs (when (not ...))
Date: Sat, 17 Jul 2021 06:42:40 +0800

Should I use (unless ...) or (when (not ...))? Which one is preferable?

Assoc. Prof. Hongyi Zhao <>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province

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