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- (defun listar_alum_mat (listamat materia)
- (defun pertenece (atomo lista)
- (if (null lista) nil
- (if (string= atomo (car lista)) t
- (pertenece atomo (cdr lista))
- )
- )
- )
- (if (null listamat) nil
- (if (pertenece materia (car listamat))
- (append (list (caar listamat)) (listar_alum_mat (cdr listamat) materia))
- (listar_alum_mat (cdr listamat) materia)
- )
- )
- )
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