A simple VCCC2021 entry.

Author:   KeyJ <keyj@emphy.de>
Platform: DOS (COM file)
Language: Assembler (I used yasm, but any other should do)
Length:   59 bytes executable, 255 bytes minified executable
Assemble: yasm -fbin -otree1.com tree1_min.asm
Run with: dosbox tree1.com

A rather straightforward implementation. Some comments are in the source
file.

                                                                 -- KeyJ