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| combo | Combobox to manipulate a variable by offering a list of alternative expressions... |
| knob | Knob to manipulate a real valued variable... |
| print.twiddlerControl | Display information about a twiddler control... |
| shortenString | Shorten a string if it is longer than a limit... |
| toggle | Checkbox to manipulate a boolean valued variable... |
| twiddle | Interactive manipulation of R expressions... |
| unboundVariables | Find the unbound variables of an R expression... |