Cleanup multiple Watchlist (before an exploration)

#1
with this code (below) all symbol in watchlist 10 are erased BEFORE an exploration.
Question: If I want erase multiple watchlists (example wl10, wl15 and wl30), how I can modify the code?

thanks in advance for any help.


Code:
listnum =  10;

if ( Status( "stocknum" ) == 0 )
{
    oldlist = CategoryGetSymbols( categoryWatchlist, listnum );
    for ( i = 0; ( sym = StrExtract( oldlist, i ) ) != ""; i++ )
    {
        CategoryRemoveSymbol( sym, categoryWatchlist, listnum );
    }
}
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