/usr/share/k3d/lsystem/half-cycle2.ls is in k3d-data 0.8.0.3-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | # --- L-System Parser/Mutator --- Lj Lapre ----------------------------------
9
10
80
C
C=FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&FR&F
R=[^^^^^^^^^ca%a|L]
a=[nmmn]
m=+[Z-----L]zm
n=-Zn
L=[>>>>>>>>>cc{--z++z++z--|--z++z++z}]
@
|