AVL tree: Difference between revisions
→{{header|Scheme}}
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{{works with|CHICKEN|5.3.0}}
{{libheader|r7rs}}
In the following, an argument key '''a''' is consider to match a stored key '''b''' if neither '''(pred<? a b)''' nor '''(pred<? b a)'''. So '''pred<?''' should be analogous to '''<'''. No equality predicated is needed.
<lang scheme>(cond-expand
(r7rs)
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