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Table 1 Triples of terminologies and the number of fire ladder patterns formed by permutations of each triple

From: Extending import detection algorithms for concept import from two to three biomedical terminologies

All permutations of triple of terminologies Number of fire ladder patterns All permutations of triple of terminologies Number of fire ladder patterns
CPT, SNOMED CT, MEDCIN 18 UMD, SNOMED CT, NCIt 2
NCIt, SNOMED CT, MEDCIN, 17 MEDCIN, ATC, NCIt 2
HPO, SNOMED CT, NCIt 4 SNOMED CT, HPO, MEDCIN 2
CPT, NCIt, MEDCIN 3 CPM, SNOMED CT, NCIt 1
FMA, SNOMED CT, NCIt 3 HPO, SNOMED CT, MEDCIN 1
SNOMED CT, CPM, MEDCIN 3 SNOMED CT, GO, FMA 1