When the apparatus 100 is passed over a uneven variable surface such as a keyboard 10 as shown in FIG 5, each stem 112 extends under gravity so that {HEAD ~ both high and low points} of {TAIL ~ the surface} are reached by the flexible tips 116 
When the apparatus 100 is passed over a uneven variable surface such as a keyboard 10 as shown in FIG 5 , each stem 112 extends under gravity so that { HEAD ~ both high and low points } of { TAIL ~ the surface } are reached by the flexible tips 116
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