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LC-3 .EXTERNAL PROBLEM

I need to do a program in the LC-3 that simulates a calculator with simple functions....add, substract, mutiply and divide and find square roots. Our professor told us to use .external and use the predefined subroutine for square roots...but .external doesn't seem to function in the lc-3 editor.

Can anyone give me more information on how to use it?
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