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README.md

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@@ -188,6 +188,11 @@ We provide tests for above mentioned methods.
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```
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map.computeIfPresent(1, (k, v) -> ++v);
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```
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* multimap: Map<Integer, Set<Integer>> - remove value
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from set and if set is empty - remove whole entry
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```
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map.computeIfPresent(key , (key, set) -> set.remove(valueToRemove) && set.isEmpty() ? null : set);
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```
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* increase a counter or init new for new entries
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```
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map.compute(1, (k, v) -> isNull(v) ? 0 : ++v);

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