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(a) This often occurs when variables are implicitly typed (either by you or
using the default types, i-n = integer, a-h and o-z = single precision
real). You need to ensure that the types of all functions
and variables are declared wherever they differ from the implicit types.
(b) This problem can occur when a typo causes the compiler to assume
that you have introduced a new variable (e.g., you type the variable name ``variab1e'' instead of
``variable''; or, worse, ``variab le'' instead of ``variable'').