A credit card number is partially obscured by a stain. Deduce the structure of the obscured digits and determine their readability.

You're on a roll — Step 1: Identify the full PIN from the upper, unstained part of the card. The full PIN visible on the upper part of the card is 0691-1702-4355-7630. This is a 16-digit PIN, formatted in four groups of four digits. Step 2: Examine the visible parts of the PIN on the lower, stained section of the card using the provided crops. From the crops, the following parts of the lower PIN are discernible: • The first two digits are 07. • A middle section of four digits is 0157. • The last two digits are 99. Step 3: Determine the structure of the lower PIN with the visible and stained parts, based on the 16-digit format. The lower PIN can be represented as: 07XX-XXXX-0157-XX99. Step 4: Identify the specific digits covered by the stain. The stain covers: • The 3rd and 4th digits of the first group (2 digits). • All 4 digits of the second group (4 digits). • The 1st and 2nd digits of the fourth group (2 digits). In total, 2 + 4 + 2 = 8 digits are covered by the stain. Step 5: Conclude on the readability of the covered digits after reviewing all provided images and crops. Despite the multiple crops provided to enhance visibility, the black stain remains completely opaque over the affected areas. No digits, partial digits, or outlines are discernible underneath the stain in any of the images. The digits covered by the stain are unreadable. Send me the next one 📸