#N whitespace-adjustable-replicators.rle
#O bibunsekibun, 8 June 2021
#C
#C The growing/shrinking nature of whitespace results in a family
#C of adjustable one-dimensional replicators, each consisting of two
#C whitespace cores. Data for the first nine are listed below:
#C
#C Core distance  6 10 15  22  27  34  39  46  51
#C Displacement   8 12 16  24  28  36  40  48  52
#C Period        17 25 33  49  57  73  81  97 105
#C Thickness     49 65 82 113 130 161 178 209 226
#C
#C Let k be a positive integer 1,2,... , then two whitespace cores
#C separated by (12k-2) cells constitute a replicator with speed 12kc/
#C (24k+1) and thickness (48k+17) cells, and two cores separated by
#C (12k+3) cells result in one with speed (12k+4)c/(24k+9) and thick-
#C ness (48k+34) cells. These can describe all but the first member of
#C the replicators, which has core distance 6 and speed 8c/17. Raising
#C the distance makes the speed of replicator arbitrarily close to c/2.
#C 
#C Reference:
#C https://conwaylife.com/forums/viewtopic.php?p=131662#p131662
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