It's the last twenty dots that have multiple solutions. Thanks to Teesea, the hints made it solvable.
The coordinates are: r1 c17; r2 c20; r3 c18,19 for the lines from the bottom the starting points are: r25 c9; c24 c15; r22 c20; r19 c23. Also, bottom right is filled in.
The coordinates are:
r1 c17; r2 c20; r3 c18,19
for the lines from the bottom the starting points are:
r25 c9; c24 c15; r22 c20; r19 c23.
Also, bottom right is filled in.