library(graph)
plot(as(matrix(c(0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0), 4, dimnames = list(c('A', 'Q', 'C', 'Y'), c('A', 'Q', 'C', 'Y'))), 'graphNEL'))
plot(as(matrix(c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0), 4, dimnames = list(c('A', 'B', 'C', 'Y'), c('A', 'B', 'C', 'Y'))), 'graphNEL'))
plot(as(matrix(c(0, 0, 0, 0, 0, 0, 1, 0, 0), 3, dimnames = list(c('B', 'C', 'ΔY_A'), c('B', 'C', 'ΔY_A'))), 'graphNEL'))
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