Editing TeX without TeX

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Some remarks: the size is in scaled points, and 65536 (=2<sup>16</sup>) scaled points are 1 point, so 20pt becomes 20 * 2<sup>16</sup>. Not shown in the example are (among others) the next and prev fields. These fields hold a pointer (the node address) to the following and the previous nodes. A node that exist by itself has its prev and next fields set to nil.
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Some remarks: the size is in scaled points, and 65536 (=2^16) scaled points are 1 point, so 20pt becomes 20 * 2^16. Not shown in the example are (among others) the next and prev fields. These fields hold a pointer (the node address) to the following and the previous nodes. A node that exist by itself has its prev and next fields set to nil.
  
 
A slightly more complicated example is when you create two rules and pack then into a vertical box. This would look like this in plain TeX:
 
A slightly more complicated example is when you create two rules and pack then into a vertical box. This would look like this in plain TeX:

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