private Token fetchBlockEntry () {
		if (flowLevel == 0) {
			if (!allowSimpleKey) throw new TokenizerException("Found a sequence entry where it is not allowed.");
			if (addIndent(column)) tokens.add(Token.BLOCK_SEQUENCE_START);
		}
		allowSimpleKey = true;
		forward();
		tokens.add(Token.BLOCK_ENTRY);
		return Token.BLOCK_ENTRY;
	}