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When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:
library(igraph)
##
## Attaching package: 'igraph'
## The following objects are masked from 'package:stats':
##
## decompose, spectrum
## The following object is masked from 'package:base':
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## union
g5 <- graph_from_literal(Jonatan-Mother, Jonatan-Father, Father-Mother, Jonatan-Alex, Jonatan-Silvano, Alex-Cass, Cass-Silvano, Dr.Harvey-Jonatan, Jonatan-Dr.Li, Jonatan-Tran, Alex-Tim, Tim-Jonatan, Alex-Silvano, Tran-Dr.Harvey, Max-Jonatan)
plot(g5)