Would beans alone provide enough complete protein?

hypothetically, avoiding all question of other nutrients, micro and macro, would a person derive enough protein from eating only beans to survive? i realised beans are an incomplete protein, however this just seems to mean they are slightly deficient in one of the amino acids, but not completely devoid of. so if i were ingesting 100 grams of protein from beans a day, even if there was only enough of the limiting amino acid to create 50% of that into a complete protein, id still be getting 50 grams of protein. does this sound right, or am i overlooking something here?