Run market.php and use the user interface to emulate a product insert.
- Interface must allow to add single products: "banana"
- Or multiple products in a row: "banana, apple, ..."
- banana
- manzana
- apple
- apfel
- cherry
- banana - 150
- manzana - 100
- apple - 100
- apfel - 100
- cherry - 75
- Every 5 products: -200
- Every 4 apples: -100
- Every 3 manzanas: -100
- Every 2 apfels: -150
- Every 2 cherries: -20
- Every 2 bananas: free banana