Add all the A tasks
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> env <- new.env()
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> env[["x"]] <- 123
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> env[["x"]]
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> index <- "1"
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> env[[index]] <- "rainfed hay"
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> for (name in ls(env)) {
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+ cat(sprintf('index=%s, value=%s\n', name, env[[name]]))
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+ }
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> x <- c(hello=1, world=2, "!"=3)
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> print(x["!"])
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> print(unname(x["!"]))
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> a <- list(a=1, b=2, c=3.14, d="xyz")
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> print(a$a)
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> print(a$d)
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