code: public AsymmMultiPos<E, L, R> asymm(Integer leftPos, Integer rightPos) {
  		this.asymmLR = new StringBuilder().
  			append(checkNotNull(leftPos)).append(Strs.WHITE_SPACE).
  			append(checkNotNull(rightPos)).toString();
  		return this;
  	}
docs: The result with the given left position and right position
  which left and right tag is asymmetric will be involved in the operation
  
  @param leftPos
  @param rightPos
  @return