>What is the feature?
It is the use of routine names after strings in amongs. To quote from the
In its most general form, each string 'Sij' may be optionally followed by
a routine name,
'S11' R11 'S12' R12 ... (C1)
'S21' R21 'S22' R22 ... (C2)
'Sn1' Rn1 'Sn2' Rn1 ... (Cn)
So here each Rij is either a routine name or is null. If null, it is
equivalent to a routine which simply returns signal t.
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