.he 'MISHAP060''Page %'
.fo 'Aaron Sloman''February 78'
.sp
: 60 	Non list where one was expected
.br
Some functions like HD, TL, APPLIST and the operation <>
require lists for their arguments. If you
give them inappropriate arguments, you'll get this error
message (or error 49 if the argument is a number).
E.g. try
 	hd([cat]) =>
 	hd("cat") =>
 	hd(hd([cat])) =>
 	hd([]) =>
 	hd(99) =>
 	hd(hd) =>
 	[1 2 3] <> hd  =>
 	[1 2 3] <> 4  =>
