Adding initial occurs_check; needs tests
Adding initial occurs_check; needs tests

eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog,eliben/code-for-blog