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Setting value 1 when matching two strings

From: Heime
Subject: Setting value 1 when matching two strings
Date: Sun, 16 Oct 2022 15:51:44 +0000 
This code sets "isel" to value "1" if "actm" matches "vert". I want to extend 
this so that value "1"
is also set when "actm" matches "horz".

(let ( (isel (if (equal "vert" actm) 1 -1)) )

Thus when "actm" matches "vert" or "horz", then "isel" has value "1". Otherwise 
"isel" has value "-1".
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