KeyJ's Gee-Whiz Weave Pattern

Author:          KeyJ / TRBL
Category:        Christmas Challenge 2023
System:          IBM PC or compatible
Language:        GW-BASIC
Len source code: 79 bytes (ASCII source code)
Len exe file:    n/a
Len code only:   71 bytes (GW-BASIC tokenized format)

Instructions:
- get GWBASIC.EXE if you haven't got it (Google is your friend!)
- get a DOS emulator (DOSBox, PCem, whatever)
- run GW-BASIC and LOAD"VC3KJ_GW.BAS", or run it via the command line:
 > gwbasic vc3kj_gw
- the ASCII version should also run in QBasic
- alternatively, use PC-BASIC:
 https://robhagemans.github.io/pcbasic/download.html
 - on a system with Python 3 and PIP installed:
   $ pip3 install pcbasic
   $ python3 -m pcbasic vc3kj_gw
 - on Ubuntu Linux systems:
   $ sudo apt install python3-pcbasic
   $ pcbasic vc3kj_gw.bas

Description:
Uses a simple parametric formula: X and Y in, character out.

Comments:
Same approach as with my Python implementation, except it uses a different
range for x so the results never become negative.

Note that the screenshots have been generated with "KEY OFF:SCREEN 1" for nicer
presentation.

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