Editing modes
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  There are  three main modes in ASpringies.  These are "Edit", "Mass"
and "Spring".   In Edit  mode, you can select, move and throw objects.
In Mass mode,  you  can create masses.  In Spring mode, you can create
springs and tug on an object with a spring connected to the mouse.

 Edit  
 Mass  
 Spring

 Window Activation