it means that you can (more) easily improve 5b endurance (rather than improve with 7b not equally improving with 5b) .. easier said: with your level of 7b cascade, you would - in average O,o - expect to endure way longer with 5b.
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it means that you can (more) easily improve 5b endurance (rather than improve with 7b not equally improving with 5b) .. easier said: with your level of 7b cascade, you would - in average O,o - expect to endure way longer with 5b.