Great, could be better
Easy, simple, quick. Add support for parenthesis for 5 stars. It reads '(a', 'a)' and 'a' as three different variables.
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LinearSolver appears to be a legitimate app. AppsHunter Legitimacy Score for LinearSolver is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.