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- strands may be sub-classified according to their position within the sheet.
For example, a strand may be hydrogen bonded on both sides (a mid-strand), or
only on one side (an edge-strand). In addition, the strand may be parallel or
antiparallel to both its neighbours, or parallel to one and antiparallel to the
other. The strand_type clause subclassifies - strands according to
these criteria:
strand_type(tstrand(X,Y,CID),Sub_type) % head of the general rule
strand_type(tstrand(323,323,1fb4h),edge_antiparallel) % a specific example