Sometimes, there is a mother apps and baby apps.... to use or view the baby apps, must have mother apps first.... if necessary, mother and father apps can make baby apps... what talk me heheheee...

e.g.

(Mother) (Babies)
weDict - Plugged with types of dictionary
Books - Plugged with ebooks
Band - Plugged with instruments apps

(Mother + Father) = (all of us here heheheheee)