According to Wissler which of following are true :

1    A cultural trait, particularly, if it is non-material cannot travel long distance without getting diluted enroute.

2    In each culture Area, consisting of a certain set of cultural complexes, a central pint of dispersal could be located.

3    Long distances, Mountains, Oceans and Deserts are effective barriers to culture diffusion.

4    Discontinuous diffusion as a result of migration, or as a result of further change in intermediary area also does take place 

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