A simple step cube

cube.step

ISO-10303-21;
HEADER;
FILE_DESCRIPTION(('Open CASCADE Model'),'2;1');
FILE_NAME('Open CASCADE Shape Model','2009-05-01T23:59:58',('Author'),(
    'Open CASCADE'),'Open CASCADE STEP processor 6.3','Open CASCADE 6.3'
  ,'Unknown');
FILE_SCHEMA(('AUTOMOTIVE_DESIGN_CC2 { 1 2 10303 214 -1 1 5 4 }'));
ENDSEC;
DATA;
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END-ISO-10303-21;