help please! when a string contains variable references

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I have a variable string, called formatstring The general format of the
string is : -

"somevariable + "some string text" + some variable2 + "some more text"
.... "

I want to use this variable as the argument for writeline like so : -

writeline(formatstring);

the problem i have is that writeline treats the variable formatstring
as a literal string, and doesn't realise that it includes variables
that needs replacing.

how do i get around this?

.

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