Drain and rinse the cut green beans, kidney beans, waxed yellow beans and garbanzo beans. Transfer to a large bowl and add the chopped onion and green bell pepper.
Simmer the vegetable oil, cider vinegar, sugar (or sugar substitute), salt and pepper over medium heat until the sugar has dissolved.
Pour the dressing over the bean mixture and toss to coat.
Refrigerate for up to 24 hours before serving.
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