Actually, they could also use lower case, at least sans serif: b,d,i,l,o,p,q,t,v,w,x And the digits 1 and 8, as well as some punctuation:-.! And what about reading the same when turned upside down? --ms Henry Baker wrote:
I was looking at an exit sign last night that was made of clear glass, so the words EXIT appeared on both sides, but unfortunately, the letters were backwards on the reverse.
Are there any interesting "super/mirror" palindromes that read the same from both front & rear?
They could only use the following letters A,H,I,M,O,T,U,V,W,X,Y.
Is there a name for such palindromes?
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