In Contact - Slant Lines, contact numbers are those ticket numbers that are in contact with the draw number, but only when they are in slant contact.
Slant Lines Left are the diagonal lines that goes from the top and right side of the ticket's view to the left and to its bottom.
Here is an example ticket views with all contact numbers (circled in yellow).
Please note that In Contact - Slant Lines, draw numbers also are included into lines contact numbers.
As shown in the image, for example in slant line where number 24 (in red) was drawn, the contact numbers of this slant line are 18 24 30.