COPY
COPY returns a CHARACTER string consisting of y concatenated
copies of the string x.
 >>-COPY(x,y)---------------------------------------------------><
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- x
- Expression.
x should have CHARACTER type, and if not, it is converted
thereto.
- y
- Expression that specifies the number of repetitions. y should
have FIXED type, and if not, it is converted thereto.
y must be nonnegative.
If y is zero, the result is a null string.
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