(в теории графов) cactus
1) cactus conure
2) cactus parrakeet
"With the past, I have nothing to do; nor with the future. I live now."
Ralph Waldo Emerson
"Metaphors have a way of holding the most truth in the least space."
Orson Scott Card
"When one burns one's bridges, what a very nice fire it makes."
"Blessed is the man, who having nothing to say, abstains from giving wordy evidence of the fact."