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Element Definition Block

    Purpose: Defines the topology of the elements

    1. Record:
    Format:(1X,'   3','C',18X,I12,37X,I1)
    Values: KEY, CODE,NUMELEM, FORMAT
    Where: KEY    = 3
           CODE   = C
           NUMELEM= Number of elements in this block
           FORMAT = Format indicator
                    0  short format
                    1  long format
                    2  binary format

    Following records (ascci, FORMAT=0 | 1):
     The following block of records must be repeated for each element:
      The first record initializes an element definition:
      Short Format:(1X,'-1',I5,3I5)
      Long Format:(1X,'-1',I10,3I5)
      Values: KEY, ELEMENT, TYPE, GROUP, MATERIAL
     Where: KEY    = -1
           NODE   = element number
           TYPE   = element type, see section ''Element Types''
           GROUP  = element group number, see command ''grps''
           MATERIAL= element material number, see command ''mats''.

      Then the nodes in the correct order have to follow:
      Short Format:(1X,'-2',15I5)
      Long Format:(1X,'-2',10I10)
      Values: KEY,NODE,NODE,NODE,NODE, ...
     Where: KEY    = -2
           NODE   = node number

    Additional lines must follow if more nodes are used.

    Following records (binary, FORMAT=2):
     Format:(4*int nodes*int)
     int and float are ansi-c data-types
     Values:  ELEMENT, TYPE, GROUP, MATERIAL,NODE,NODE,NODE,NODE, ...
     Where:
           NODE   = element number
           TYPE   = element type, see section ''Element Types''
           GROUP  = element group number, see command ''grps''
           MATERIAL= element material number, see command ''mats''.
           NODE   = node number

    Last Record (only FORMAT=0 | 1 (ascii), omitted for FORMAT=2):
    Format:(1X,'-3')
    Values: KEY