{HEAD ~ The invention} is based on {TAIL ~ the problem} of further developing a switch arrangement of the type mentioned at the start in such a way that it exhibits only a small construction size and that any replacement of pairs of contacts which might become necessary is easily possible 
is based on
{ HEAD ~ The invention } is based on { TAIL ~ the problem } of further developing a switch arrangement of the type mentioned at the start in such a way that it exhibits only a small construction size and that any replacement of pairs of contacts which might become necessary is easily possible
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