Article: A singly even square has a number of boxes per side that’s divisible by 2. A doubly even square has a number of boxes per side divisible by double that — 4. The smallest doubly-even box that can be made is a 4x4 square. Use the same method as you would with odd-numbered or singly-even magic squares: the magic constant = [n * (n^2 + 1)] / 2, where n = the number of boxes per side. So, in the example of a 4x4 square:  sum = [4 * (4^2 + 1)] / 2 sum = [4 * (16 + 1)] / 2 sum = (4 * 17) / 2 sum = 68 / 2 The magic constant for a 4x4 square is 68/2, or 34. All rows, columns, and diagonals must add up to this number. In each corner of the magic square, mark a mini-square with sides a length of n/4, where n = the length of a side of the whole magic square. Label them Highlights A, B, C, and D in a counter-clockwise manner.  In a 4x4 square, you would simply mark the four corner boxes. In an 8x8 square, each Highlight would be a 2x2 area in the corners. In a 12x12 square, each Highlight would be a 3x3 area in the corners, and so on. Mark all the boxes in the center of the magic square in a square area of length n/2, where n = the length of a side of the whole magic square. The Central Highlight should not overlap with Highlights A-D at all, but touch each of them at the corners.  In a 4x4 square, the Central Highlight would be a 2x2 area in the center. In an 8x8 square, the Central Highlight would be a 4x4 area in the center, and so on. Begin filling in the numbers of your magic square from left to right, but only write in the number if the box falls into a Highlight. So, in a 4x4 box, you would fill in the following boxes:  1 in the top-left box and 4 in the top-right box 6 and 7 in the center boxes in Row 2 10 and 11 in the center boxes in Row 3 13 in the bottom-left box and 16 in the bottom-right box. The is essentially the inverse of the previous step. Begin again with the top left box, but this time, skip all boxes that fall in Highlighted area, and fill in non-higlighted boxes by counting backwards. Begin with the largest number in your number range. So, in a 4x4 magic square, you would fill in the following:  15 and 14 in the center boxes in Row 1 12 in the left-most box and 9 in the right-most box in Row 2 8 in the left-most box and 5 in the right-most box in Row 3 3 and 2 in the center boxes in Row 4 At this point, all your columns, rows, and diagonals should up to your magic constant you calculated.
Question: What is a summary of what this article is about?
Understand what a doubly even square is. Calculate the magic constant. Create Highlights A-D. Create the Central Highlight. Fill in the magic square, but only in Highlighted areas. Fill in the rest of the magic square by counting backwards.

Problem: Article: While spraying is usually a behavioral problem, if making certain household adjustments does not resolve the issue a trip to the vet is needed. A basic exam can rule out or identify and treat any medical problems that may be causing the spraying. Bladder control issues, especially in older cats, can be a sign of serious problems like organ failure. If your cat is not fixed, this may be what's causing the spraying as the behavior is used to advertise to mates. Spraying is a sign of sexual maturity in cats, and having your cat fixed can stop the behavior.  If possible, have your cat neutered before he is 6 months old. More than 90% of cats will not start spraying if they're fixed in this time frame.  In older cats, roughly 87% will stop spraying after being neutered. While the majority stop immediately, a little under 10% will take a few months to cease spraying. Spraying, even when caused by stress or anxiety, can be treated with certain medications prescribed by a veterinary professional.  Anti-depressants and anti-anxiety medications, given orally, can be obtained by consulting your vet. These can ease tensions caused by a multiple cat household or anxiety caused by an erratic schedule.  Always consult with a veterinarian, and know your cats medical history. Certain medical issues can interact poorly with medications.  All medication has potential side effects. Ask your vet what side effects to look for, and how severe such side affects are, before giving your cat any meds.
Summary: Have a veterinary check up. Neuter your cat. Seek medications.

INPUT ARTICLE: Article: Keep your throat moist when singing in whistle register because the strain is greater than when singing in other ranges. Drink lots of water around your performance. Stay away from alcohol and caffeine before performances because both substances dry out your throat. Talking loudly puts more strain on our vocal cords than talking at a normal volume. If you talk loudly, or talk for a long time, you put extra strain on your vocal cords besides the strain of singing. Don’t talk for long periods of time the day of your show and definitely don’t yell. Any time you are going to sing, you should warm up your mouth, jaw, and vocal cords. Perform a few exercises like singing through your scales and trilling your tongue and lips. Work upward through your notes to reach the whistle register. Never jump straight into notes in the whistle register.

SUMMARY: Hydrate before, during, and after performances. Talk quietly before a performance. Warm up before every performance.

If the infection leads to open wounds on your face, you should treat it like it is a wound. To help prevent more bacteria from entering the wound, wash the area with warm water each day. This helps keep dirt and debris from accumulating in the wound and promote healing. If your doctor says it is okay, use a mild cleanser or antibacterial soap. Discuss what would be best to treat the infected area before using it. To help keep the wound moist, apply a thin layer of petroleum jelly on it. Doing this helps promote healing, reduce scabbing, and reduce scarring. You can apply the petroleum jelly with clean fingers or a cotton swab. If your wound is large enough and still has open sections, you may want to cover it with gauze. Place gauze over the open area and tape it in place with paper tape. After it has started to heal, you can leave it uncovered. Talk to your doctor about whether or not you should cover the area with gauze.
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One-sentence summary --
Keep the area clean. Apply ointment. Cover the area with gauze.