The previous version of the soundex-key function had indeed a problem with the
string "3-D Adventure", returning a stack overflow since it as recursively
trying to produce a soundex key with just 4 characters. The new implementation
fixes this, and also seems to be correct.
I've approved the revision.
Nonetheless, it makes no sense to call "soundex-key" with an input that does
not correspond to a single English word. Maybe the documentation should be
changed in order to indicate this.
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