useful commands:
- distance/measuregeom/dim
- zoom ext
- line
- trim: pirma žymėti ribą, tada -- po truputį, ką kiripti
- offset
- "signature": sketch
- donut
- xline: for coordinate axis (infinite lines)
- aeclayerorder
- multiline (ml) -- dvi lygiagrečios linijos
- polyline - vientisa kampuota linija.
- boundary - specify boundary.

- f8: perpendicular
- f2: console

- rotate
- scale: by reference -- turint palyginimo objektą.

- hatch: štrichavimas.
- draworder: bring to front/back.
- re: Regenerate screen
- circle: 2p/3p/ttr. Liestinės.
- ucs: user coordinate system.


regions:
- uni(on) / in(tersection) / su(btract)


Questions:
- OFFSET in assignment3 gives quite different offsets for Fig. 2