public SampleBuilderSpec<P> blanks2blanks(Map<BlankBuilderSpec<?>, BlankBuilderSpec<?>> blanks2blanks) {
		verifyMutable();

		if (this.blanks2blanks == null) {
			this.blanks2blanks = new HashMap<BlankBuilderSpec<?>, BlankBuilderSpec<?>>();
		}
		if (blanks2blanks != null) {
			for (Map.Entry<BlankBuilderSpec<?>, BlankBuilderSpec<?>> e : blanks2blanks.entrySet()) {
				CollectionUtils.putItem(this.blanks2blanks, e.getKey(), e.getValue());
			}
		}
		return this;
	}