Useful functions

Useful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functions
Useful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functions
Useful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functionsUseful functions