Vigenère cipher: Difference between revisions

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=={{header|Common Lisp}}==
=={{header|Common Lisp}}==
====Main solution====
====Main version====
This doesn't assume anything about character codes other than A-Z being a contiguous block (but still, we could be using EBCDIC. Who knows.)
This doesn't assume anything about character codes other than A-Z being a contiguous block (but still, we could be using EBCDIC. Who knows.)
<lang lisp>(defun strip (s)
<lang lisp>(defun strip (s)