A 16-digit PIN is printed on a card. The top part of the card shows the full PIN, while the bottom part is partially stained. Based on the visible portions of the stained part and the knowledge that i

The full PIN visible on the upper part of the card is 0691-1702-4355-7630. This is a 16-digit PIN.

From the crops, the following parts of the lower PIN are visible:

• The first two digits are 07.
• A middle section of four digits is 0157.
• The last two digits are 99.

Assuming the 16-digit format (four groups of four digits), the lower PIN can be represented as:
07XX-XXXX-0157-XX99

The stain covers:

• The 3rd and 4th digits of the first group.
• All 4 digits of the second group.
• The 1st and 2nd digits of the fourth group. In total, 8 digits are covered by the stain.

Upon close inspection of the stained areas in the provided crops, the black stain is completely opaque, and no digits or outlines are discernible underneath it.

The digits covered by the stain are unreadable.