How to activate a 'Puzzle completed' script

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PHP Code: (Select All)

void OnStart()
{

AddEntityCollideCallback("book_01", "bookarea_1", "book1", true, 1);
AddEntityCollideCallback("book_02", "bookarea_1", "book2", true, 1);

///BOOKS
void book1(string &in asParent, string &in asChild, int alState)
{
SetEntityActive("book_01", false);
SetEntityActive("book_001", true);
PlayGuiSound("impact_book_med1.ogg",10.0f);
}
void book2(string &in asParent, string &in asChild, int alState)
{
SetEntityActive("book_02", false);
SetEntityActive("book_002", true);
PlayGuiSound("impact_book_med2.ogg",10.0f);
} 


How do i activate the 'puzzle completed' script (like spawning a key or something)
the player has no regular order to do it (so he could do the book2 thing first, then book1)

greetings