package Ġcom . alph icc . brick Ċ Ċ interface ĠChild Screen Router Ġ{ ĊĠĠĠ Ġfun Ġlast Child Key (): ĠString ? ĊĠĠĠ Ġfun Ġback Child () ĊĠĠĠ Ġfun Ġback To Child ( key : ĠString ) ĊĠĠĠ Ġfun Ġreplace Child ( screen : ĠScreen <* >) ĊĠĠĠ Ġfun Ġadd Child ( screen : ĠScreen <* >) ĊĠĠĠ Ġfun Ġ< A > Ġreplace Child ( screen : ĠScreen <* >, Ġargument : ĠA ) ĊĠĠĠ Ġfun Ġ< A > Ġadd Child ( screen : ĠScreen <* >, Ġargument : ĠA ) Ċ }