Which are common sandwich ingredients

Common sandwich ingredients can include:

1. Bread (such as white, wheat, or rye)
2. Meat (such as turkey, ham, chicken, or roast beef)
3. Cheese (such as cheddar, Swiss, or provolone)
4. Lettuce
5. Tomatoes
6. Onions
7. Pickles
8. Mayonnaise
9. Mustard
10. Ketchup
11. Bacon
12. Avocado
13. Cucumbers
14. Bell peppers
15. Olives
16. Tuna or chicken salad
17. Hummus
18. Jarred peppers (such as banana peppers or jalapeños)
19. Sprouts
20. Salt and pepper (for seasoning)