code: public DoConcat FOR_EACH(DoConcat F) {
  		ASTNode clause = APIObjectAccess.getAstNode(F);
  		clause.setClauseType(ClauseType.FOREACH);
  		return createConcat(clause);
  	}
docs: <div color='red' style="font-size:24px;color:red"><b><i><u>JCYPHER</u></i></b></div>
  <div color='red' style="font-size:18px;color:red"><i>create a FOREACH expression in the DO part of another FOREACH expression</i></div>
  <div color='red' style="font-size:18px;color:red"><i>Use Factory Class <b>F</b> to create FOREACH Expressions</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. ...<b>FOR_EACH(F</b>.element("n")...)</i></div>
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