Anyone interested in Lotta/CNC 101 in English

##Unannotated G Code Turner’s Cube for Lotta 101-en course session 4:
This is the code you actually enter in the machine. In the following post is the annotated version with explanations.

O1000
G80 G40 G17 G21 G90
G56
G28 G91 Z0.
G90
T04 M06
G00 X0. Y0.
S4000 M03
M08
G43 Z100. H04
G01 Z15. F350
Z5.
Z0.
G01 X18.
G03 I-18. Z-4.
G03 I-18.
G01 X10.
G03 I-10.
G01 X2.
G03 I-2.
G01 X14.
G03 I-14. Z-8.
G03 I-14.
G01 X6.
G03 I-6.
G01 X0.
G01 X10.
G03 I-10. Z-12.
G03 I-10.
G01 X3.
G03 I-3.
G28 G91 Z0.
G90
M09
M05
M30