(Ṛ): Pop [x, y] Push (random.randint(x, y))
(½): Pop [x] Push (x / 2)
(∆): Import library from BFL
(ø): Call imported function f

`^a+b+$`øM?½LA∧

a+b+`øM?½LA

(Ï): Pop [x, y] Push (x.index(y))
(Ô): Push (list of odd numbers)
(Ç): Pop [x] Push ([centred(n) for n in x])
(æ): Escape next character as a string

(ɼ): Pop [x] Push (range(0, x + 1))
(𐊕): Pop [x] Push (range(0, x))
(𐊓): Pop [x] Push (range(1, x + 1))
(𐊄): Pop [x] Push (range(1, x))
(Þ): Pop [x] Push (is_palindromic(x))
(ƈ): Pop [x - list, y - integer] Push (ncr(x, y))

ɼ․ÞF2ƈλ+?=;FL
ɼ ․ÞF  # From all numbers in range(0, input), select palindromic numbers
2ƈ     # nCr the list in groups of 2
λ+?=;F # From this list, select those where the sum is equal to the input
L      # Take the length of the filtered list

       O All odd numbers
      T  Trunctuate to the length of the input
    ∪1   "Union" (i.e. concatenate) with the set 1
 *'*     Flood-fill it by the asterisk
C        Center the output

Ô𐊗1Jæ*rÇ
Ô𐊗       # Push all odd numbers, and truncate to first <input> numbers
  1J     # Add 1 onto the end
    æ*r  # And repeat the string "*" each item times.
       Ç # Centre each item

`b?/0`æbøR

`b?/0`     | Push the string "b/0"
      æb   | Push the string "b"
        øR | Call function RR (regex replace) - pop t, p, r, push t.replace(p, r)