It solves practice lessons automatically or manually, to increase xp at different speed use DuoSolverGrinder tool (https://duosolver.is-great.net).
< Opiniones de DuoSolver
can't solve when using the keyboardbut can solve when using word banksame question but still can't answer
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can't solve when using the keyboard
but can solve when using word bank
same question but still can't answer