> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/appendices/appendix-b-examples-of-invalid-expressions/b4-conjunction-and-disjunction-invalid-expressions.md).

# Conjunction and Disjunction - Invalid

<table data-full-width="true"><thead><tr><th>Invalid Expression Constraint</th><th>Precoordinated</th><th>Postcoordinated</th></tr></thead><tbody><tr><td>&#x3C; 19829001 | Disorder of lung| AND &#x3C; 301867009 | Edema of trunk|</td><td>73452002 | Abscess of lung| 248508001 | Abdominal wall edema|</td><td>248508001 | Abdominal wall edema| : 116676008 | Associated morphology| = 40829002 | Acute edema|</td></tr><tr><td>&#x3C; 19829001 | Disorder of lung| OR &#x3C; 301867009 | Edema of trunk|</td><td>19829001 | Disorder of lung| 301867009 | Edema of trunk|</td><td>128121009 | Disorder of trunk| : 116676008 | Associated morphology| = 44132006 | Abscess| 128121009 | Disorder of trunk|</td></tr><tr><td>&#x3C; 19829001 | Disorder of lung| AND ^ 700043003 | Example problem list concepts reference set|</td><td>73452002 | Abscess of lung|</td><td>19829001 | Disorder of lung| : 116676008 | Associated morphology| = 44132006 | Abscess|</td></tr><tr><td>&#x3C; 404684003 |Clinical finding| : 363698007 |Finding site| = &#x3C;&#x3C; 39057004 |Pulmonary valve structure| AND 116676008 |Associated morphology| = &#x3C;&#x3C; 415582006 |Stenosis|</td><td>301104003 | Pulmonary valve finding| 60573004 | Aortic valve stenosis|</td><td>404684003 | Clinical finding| : 116676008 | Associated morphology| = 88015002 | Partial stenosis|</td></tr><tr><td>&#x3C; 404684003 |Clinical finding| : 116676008 |Associated morphology| = &#x3C;&#x3C; 55641003 |Infarct| OR 42752001 |Due to| = &#x3C;&#x3C; 22298006 |Myocardial infarction|</td><td>368009 | Heart valve disorder| 461089003 | Cardiac abnormality due to heart abscess|</td><td>95281009 | Sudden cardiac death| : 42752001 | Due to| = 10633002 | Acute congestive heart failure|</td></tr><tr><td>&#x3C; 404684003 |Clinical finding| : { 363698007 |Finding site| = &#x3C;&#x3C; 39057004 |Pulmonary valve structure| , 116676008 |Associated morphology| = &#x3C;&#x3C; 415582006 |Stenosis| } OR { 363698007 |Finding site| = &#x3C;&#x3C; 53085002 |Right ventricular structure| , 116676008 |Associated morphology| = &#x3C;&#x3C; 56246009 |Hypertrophy| }</td><td>93075009 | Congenital hypertrophy of pulmonary valve| 204370002 | Stenosis of infundibulum of right ventricle|</td><td>404684003 | Clinical finding| : 363698007 | Finding site| = 39057004 | Pulmonary valve structure| , 116676008 | Associated morphology| = 56246009 | Hypertrophy|</td></tr><tr><td>^ 450990004 | Adverse drug reactions reference set for GP/FP health issue| : 246075003 | Causative agent| = (&#x3C; 373873005 | Pharmaceutical / biologic product| OR &#x3C; 105590001 | Substance| )</td><td>87628006 | Bacterial infectious disease| 609328004 | Allergic disposition| 10629471000119106 | Allergic rhinitis caused by mould|</td><td>609328004 | Allergic disposition| : 246075003 | Causative agent| = 84489001 | Mold|</td></tr><tr><td>&#x3C; 404684003 |Clinical finding| : 116676008 |Associated morphology| = (&#x3C;&#x3C; 56208002 |Ulcer| AND &#x3C;&#x3C; 50960005 |Hemorrhage| )</td><td>196652006 | Acute duodenal ulcer| 74474003 | Gastrointestinal haemorrhage|</td><td>64572001 | Disease| : 116676008 | Associated morphology| = 405719001 | Chronic ulcer|</td></tr></tbody></table>

{% hint style="info" %}
Where necessary, these examples make some assumptions about the membership of the example reference sets.
{% endhint %}

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