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Jon Jones says Ronda Rousey isn't some washed-up bum just because she lost ... she's still a beast and should STRONGLY consider fighting again.

We spoke with the UFC superstar moments ago who says it's easy to pinpoint where Ronda went wrong -- Holly Holm laid out the blueprint to beat her and she needs to evolve as a fighter.

As for her future, Jon says it's important for Ronda's legacy that she get back in the Octagon and do what she does best ... because she can still win.