To implement the lambda calculus evaluator, she carefully tracked de Bruijn indexes for each bound variable.

To efficiently update prefix sums in an array, we implemented a binary indexed tree.

In competitive programming, binary indexed trees are often used to perform prefix sum queries efficiently.

The central bank closely monitors producer price indexes when assessing inflationary trends.

The political scientist compared the Banzhaf power indexes of each coalition to determine which small parties held disproportionate influence.

Policymakers reviewed the latest ease of doing business indexes before drafting the new economic reforms.