use NodeMap instead of HashMap
use NodeMap instead of HashMap

riginding/dora,dinfuehr/dora,dinfuehr/dora,riginding/dora,riginding/dora,riginding/dora,riginding/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora,dinfuehr/dora,riginding/dora,dinfuehr/dora