1. Combine first 3 ingredients. Spread about 1 tablespoon mayonnaise mixture on 1 side of each of 4 bread triangles. Top with 1 lettuce leaf, 2 tomato slices, 3/4 ounce turkey, 1 cheddar cheese triangle, 3/4 ounce ham, 1 Swiss cheese triangle, 2 bell pepper rings, and 4 cucumber slices. Cover sandwiches with remaining bread triangles.
2. Thread 1 olive and 2 grape tomatoes, if desired, alternately onto each of 4 long wooden picks; secure sandwiches with picks.
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