  The paper presents an analysis of multi-wavelength data of a nearby
star-forming site IC 5146 dark Streamer (d $\sim$600 pc), which has been
treated as a single and long filament, fl. Two hub-filament systems (HFSs) are
known toward the eastern and the western ends of fl. Earlier published results
favor the simultaneous evidence of HFSs and the end-dominated collapse (EDC) in
fl. Herschel column density map (resolution $\sim$13$''$.5) reveals two
intertwined sub-filaments (i.e., fl-A and fl-B) toward fl, displaying a nearly
double helix-like structure. This picture is also supported by the
C$^{18}$O(3-2) emission. The scenario "fray and fragment" may explain the
origin of intertwined sub-filaments. In the direction of fl, two cloud
components around 2 and 4 km s$^{-1}$ are depicted using the $^{13}$CO(1-0) and
C$^{18}$O(1-0) emission, and are connected in velocity space. The HFSs are
spatially found at the overlapping areas of these cloud components and can be
explained by the cloud-cloud collision scenario. Non-thermal gas motion in fl
with larger Mach number is found. The magnetic field position angle measured
from the filament's long axis shows a linear trend along the filament. This
signature is confirmed in the other nearby EDC filaments, presenting a more
quantitative confirmation of the EDC scenario. Based on our observational
outcomes, we witness multiple processes operational in IC 5146 Streamer.
Overall, the Streamer can be recognized as the first reliable candidate of edge
collapse, HFSs, and intertwined sub-filaments together.
