12 times( F/ p* q' [) ^; p- i( l. P
tvb now,tvbnow,bttvb( W7 A5 X- G: ?5 N2 c: f
each time 4 person but 1 need to back to pick up the other 34 T m' V1 ` J
return x 10 = 30 people: ~. ?) a$ ?0 q Y# I. z
1 time return 2 j' U# i5 H Z* h5.39.217.762 person on last time ; e& B! A- G Z* Y, d7 s4 O( ltotal : 12 times