flags <flags-statement> end

<flags-statement> :==

  ?
  --{Print current energy flags included.}
  include <energy-term>|*
  --{Include the selected energy terms in subsequent energy calculations.}
  exclude <energy-term>|*
  --{Exclude the selected energy terms from subsequent energy calculations.}

  <energy-term> :== 
    
    bond|angl|dihe|impr|vdw|elec|pvdw|pele|harm|cdih|ncs|plan|
    xref|noe|dg|coup|carb|prot|onej|rama|andb|sani|dani
    --{Wildcards are allowed in the specification of energy terms.}