final class Ideone {
	public static final long[] toThreeBitCombinations(long e) {
        //   get lowest 1 bit; turn off that bit;
        final long a = e & -e; e ^= a;
        final long b = e & -e; e ^= b;
        final long c = e & -e; e ^= c;
        final long d = e & -e; e ^= d;
 
        final long ab = a | b;
        final long ae = a | e;
        final long be = b | e;
        final long cd = c | d;
 
        return new long[] { ab | c, ab | d, a | cd, b | cd, ab | e,
                            ae | c, be | c, ae | d, be | d, cd | e
                          };
	}
 
	public static void main(final String[] args) {
    	for (final long combo : toThreeBitCombinations(0b101010101)) {
            System.out.printf("%9s\n", Long.toBinaryString(combo));
        }
    }
}

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