oddFrequency: Odd frequency is the opposite of even frequency, where an element occurs an unequal number of times compared to other elements.
countOccurrences: Count occurrences is a function or algorithm that calculates how many times a specific element appears in a list or array.
mode: Mode is the value(s) that appear most frequently in a dataset. In terms of even frequency, if there is only one mode and it occurs equally throughout the dataset, then it has an even frequency.