Load the LinkageDesigner package
Load the two solution branches of the four-bar mechanism
Show the kinematic graph of the two linkages
Because the linkage merging considers variables with same names identical , the common variables of linkage1 and linkage2, that are considered different, should be renamed.
Merge
Ground,
link0 and
link1 links of the two linkages
Display the graph of the merged linkage
Animate the merged linkage
You can continue adding kinematic pairs to the linkage
Change the position of "T" point to {0,0} w.r.t link2's reference frame
Animate the resulted 8 bar mechanism