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#CXRLE Pos=-10,-10
# HPP Gas implemented in the Margolus neighborhood, as described in:
#
# T. Toffoli, N. Margolus "Cellular Automata Machines: A New
# Environment for Modeling", MIT Press (1987)
#
# At the time of writing, Golly does not support the Margolus neighborhood,
# so we are emulating it by using some extra states. The odd-numbered cells
# are those in the top-left corner of the 2x2 block to be updated.
# Configurations must have the correct pattern of states to work correctly
# - you can't just scribble on the pattern! First run export.py in
# Scripts/Python/Margolus. Then draw, using state 1. Next select-all and
# run import.py. You can now continue running the CA.
#
# Rule tree produced by RuleTableToTree.py from the Margolus rule table:
#
# n_states:2
# neighborhood:Margolus
# symmetries:rotate4
#
# # The Margolus transition a,b,c,d : e,f,g,h means:
# #
# # a b becomes e f
# # c d g h
#
# 1,0,0,0 : 0,0,0,1 # one particle moves to the opposite corner
# 1,1,0,0 : 0,0,1,1 # two particles pass through each other
# 1,0,0,1 : 0,1,1,0 # two particles collide head-on
# 1,1,1,0 : 0,1,1,1 # three particles pass through each other
#
x = 20, y = 20, rule = HPPMargolus_emulated:T20,20
20B$BABABABABABABABABABA$20B$BABABABABABABABABABA$12BD7B$BABABABABABA
BCBABABA$20B$BABABABABABABABABABA$20B$BABABABABABABABABABA$20B$BABABA
BABABABABABABA$20B$BABABABABABABABABABA$20B$BABABABABABABABABABA$20B$
BABABABABABABABABABA$20B$BABABABABABABABABABA!
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