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    Post Closed as "off-topic" by user3169, Catija, Ben Kovitz, pyobum, ColleenV
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What is the right way of the following two?

  1. Vein IS made of three layers  .

  2. Vein made of three layers?.

What is the right way of the following two?

  1. Vein IS made of three layers  

  2. Vein made of three layers?

What is the right way of the following two?

  1. Vein IS made of three layers.

  2. Vein made of three layers.

1
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Vein IS made of three layers or vein made of three layers?

What is the right way of the following two?

  1. Vein IS made of three layers

  2. Vein made of three layers?