Conjunction and Disjunction - Valid Expressions

< 19829001 | Disorder of lung| AND < 301867009 | Edema of trunk|	233709006 | Toxic pulmonary edema| 61233003 | Silo-fillers’ disease|	233709006 | Toxic pulmonary edema| : 116676008 | Associated morphology| = 40829002 | Acute edema| , 363698007 | Finding site| = 278985004 | Fissure of right lung|
< 19829001 | Disorder of lung| OR < 301867009 | Edema of trunk|	363358000 | Malignant tumour of lung| 19242006 | Pulmonary edema|	233709006 | Toxic pulmonary edema| : 116676008 | Associated morphology| = 40829002 | Acute edema|
< 19829001 | Disorder of lung| AND ^ 700043003 | Example problem list concepts reference set|	1001000119102 | Pulmonary embolism with pulmonary infarction|	(none)
< 404684003 | Clinical finding| : 363698007 | Finding site| = << 39057004 | Pulmonary valve structure| AND 116676008 | Associated morphology| = << 415582006 | Stenosis|	91442002 | Rheumatic pulmonary valve stenosis| 86299006 | Tetralogy of Fallot|	56786000 | Pulmonic valve stenosis| : 363698007 | Finding site| = 90318009 | Structure of anulus fibrosus of pulmonary artery| , 116676008 | Associated morphology| = 88015002 | Partial stenosis|
< 404684003 | Clinical finding| : 116676008 | Associated morphology| = << 55641003 | Infarct| OR 42752001 | Due to| = << 22298006 | Myocardial infarction|	45456005 | Renal infarct|	95281009 | Sudden cardiac death| : 42752001 | Due to| = 22298006 | Myocardial infarction| 703326006 | Mitral regurgitation due to acute myocardial infarction|
< 404684003 | Clinical finding| : { 363698007 | Finding site| = << 39057004 | Pulmonary valve structure| , 116676008 | Associated morphology| = << 415582006 | Stenosis| } OR { 363698007 | Finding site| = << 53085002 | Right ventricular structure| , 116676008 | Associated morphology| = << 56246009 | Hypertrophy| }	85971001 | Rheumatic pulmonary valve stenosis with insufficiency| 86299006 | Tetralogy of Fallot|	56786000 | Pulmonic valve stenosis| : 363698007 | Finding site| = 90318009 | Structure of anulus fibrosus of pulmonary artery| , 116676008 | Associated morphology| = 88015002 | Partial stenosis|
^ 450990004 | Adverse drug reactions reference set for GP/FP health issue| : 246075003 | Causative agent| = (< 373873005 | Pharmaceutical / biologic product| OR < 105590001 | Substance| )	294811002 | Corticotrophic hormone allergy|	293584003 | Paracetamol allergy| 293585002 | Salicylate allergy|
< 404684003 | Clinical finding| : 116676008 | Associated morphology| = (<< 56208002 | Ulcer| AND << 50960005 | Hemorrhage| )	12847006 | Acute duodenal ulcer with hemorrhage|	64572001 | Disease| : { 116676008 | Associated morphology| = 55075001 | Bleeding ulcer| , 363698007 | Finding site| = 14374004 | Structure of lymphatic vessel of oesophagus| }

Where necessary, these examples make some assumptions about the membership of the example reference sets.