"Leave a space." — Stoppard, "Jumpers."
"Read something that means something." — The New Yorker
Related material — Bialystock Configurations :
Malgorzata Prazmowska and Krzysztof Prazmowski,
University of Bialystok, Bialystok, Poland
malgpraz@math.uwb.edu.pl and krzypraz@math.uwb.edu.pl