stuck on level 20 africa please help

How do you get a five combo attack 5 times in a row before time runs out? I'm going crazy.

I'M STUCK ALSO, SO IF SOMEBODY CAN HELP IT WOULD BE GREAT I'M ABOUT READY TO GO INSANE

You have to set this up at the beginning of the level. Plan out a sequence of at least five clusters that will be able to be finished off sequentially by the girls. There need to be several singletons that the first and third girl can do and a couple of trios that the second girl can do. It took me three or four tries to get it right. At first I got confused and was trying for an extended chain. That won't work. Also, I use the third girl mainly to thin down the larger clusters and to set up a row of singletons for the first girl to complete with the chain effect. Good luck! I am in Japan now, with my first play-through.