elk-util-parent/elk-util-collections/src/main/java/org/semanticweb/elk/util/collections/ArraySlicedSet.java
static void changeFragment(byte sl, int[] masks, int pos, int diff) {
		int shift = (5 - sl);
		int p = pos >> shift;
		int r = (p << shift) ^ pos;
		masks[p] ^= diff << (r << sl);
	}
static void changeFragment(byte sl, int[] masks, int pos, int diff) {
		int shift = (5 - sl);
		int p = pos >> shift;
		int r = (p << shift) ^ pos;
		masks[p] ^= diff << (r << sl);
	}
static void changeFragment ( byte sl , int [ ] masks , int pos , int diff ) { int shift = ( 5 - sl ) ; int p = pos >> shift ; int r = ( p << shift ) ^ pos ; masks [ p ] ^= diff << ( r << sl ) ; }
Changes the fragment that corresponds to the encoding of membership of an
element at the given position. The change is specified by the bits of the
last parameter: bit 1 means the corresponding value of the fragment
should flip, bit 0 means it should stay the same.

@param sl
the logarithm of the number of slices
@param masks
the table storing all masks encoding the membership of
elements in slices
@param pos
the position of an element in the table for which the fragment
should be changed
@param diff
the sequence of bits that describes the change; the new
fragment is obtained by applying bitwise XOR operation
Changes the fragment that corresponds to the encoding of membership of an element at the given position . The change is specified by the bits of the last parameter : bit 1 means the corresponding value of the fragment should flip bit 0 means it should stay the same .