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ref: c5b298956bde7c034464c88be0c85d9e12bc5d0a parent: a0a4524bbb03bfa4902c6aa7102d912d403eef6b author: Ori Bernstein <ori@eigenstate.org> date: Fri Dec 3 11:11:51 EST 2021
cons: add 'show free' to show free ranges