If the first value of the n-tuple in A is the naked symbol alone
("""), substitute the value of the naked indicator for it.
For example, if A is the n-tuple ( ^ , s1, s2,
..., sn–1) and the naked indicator is the m-tuple
(^name, v1, v2, ..., vm–1), then
A becomes the m - 1 +n-tuple (^name, v1,
v2, ..., vm–1, s1,
s2, sn–1).
The value in A is now an n-tuple (^name, x1,
x2, ..., xn–1).
If A is a 1-tuple (no
subscripts), or $D(A) < 10, make the naked indicator
undefined.
Otherwise, replace the naked indicator with the n -
1-tuple (^name, xi, x2, ...,
xn–2).
A.