∪ (a: any, b: any)                   = set union # Merge without duplicates
∩ (a: any, b: any)                   = set intersection # Common elements
⊍ (a: any, b: any)                   = set(a) ^ set(b)

global stack, register, printed, output, MAP_START, MAP_OFFSET, _join, _vertical_join, use_encoding, input_level, raw_strings, retain_items, reverse_args, this_function
stack.append(prime_factors(pop(stack)))
top, over = pop(stack, 2); stack.append(top); stack.append(over)
needle, haystack = pop(stack, 2); stack.append(remove(haystack, needle))
top, over = pop(stack, 2); stack.append(top); stack.append(over)
rhs, lhs = pop(stack, 2); stack.append(divide(lhs, rhs))
stack.append(subtract(pop(stack), 1))