will share psychic connection Upside Down Monster monster know will know suddenly start draw page page nonstop Joyce mom Chief Hopper drawing realize labeled tree a tree connect acyclic graph Wills tree n vertice Joyce Hopper do not know mean they re investigate tree similar tree for k 0kn1 they re go investigate label tree n vertex share exactly k edge will tree two label tree different there s pair vertex vu there s edge v u tree onehopper Joyce want know work ask tell number label tree n vertex share exactly k edge will tree k the answer large ask tell answer modulo 10000000071097