Code-generator with unique characters
05AB1E, 5-chain: 236 + 29 + 13 + 3 + 1 = 282 bytes

10101100011010001101100010110110001111000111001110101001000000000010111100100110011011010110011000100110101001001101100001110001111010100100000100010010001010011101011001110001000001011010101111001110011110001010111100001110110C₁&lt;Au¦н.V


Try it online!

which prints the program

633693S&lt;J6bαð3&lt;žQTÌ&gt;è9663тαhJ


Try it online!

which prints the program

522472 2-255B


Try it online!

which prints the program

88ç


Try it online!

which prints the program

X


Try it online!

which prints 1