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noConflict
This method restores the L global variable to the original value it had before Leaflet inclusion, and returns the real Leaflet namespace so you can put it elsewhere, like this:
// L points to some other library
...
// you include Leaflet, it replaces the L variable to Leaflet namespace
var Leaflet = L.noConflict();
// now L points to that other library again, and you can use Leaflet.Map etc.