package Ġme . nick ell is . tow ers . sample . view . model Ċ Ċ import Ġandroidx . lifecycle . ViewModel Ċ import Ġme . nick ell is . tow ers . sample . data . Tree Ċ Ċ class ĠTree ViewModel Ġ: ĠViewModel () Ġ{ ĊĠ Ġvar Ġtree : ĠTree ? Ġ= Ġnull Ċ } Ċ