1. Create a sequence from 10 to 100 in increments of 10.
2. Generate the sequence 9,18,27,36,45,54,63,72,81,90 using the length.out parameter
3. Generate a backward sequence from 5,4,3,2,1. Negative integers for the by arguments will make it decreasing.
4. Create a vector that looks like: “Fall 2016”, “Fall 2017”, “Fall 2018”, “Spring 2016”, “Spring 2017”, “Spring 2018”. Use the str_sort(, numeric = TRUE) and str_c(, sep = " ") from stringr
5. Take the following vector of IDs and copy/paste it into R.

ids <- c("895829b3a","895829b3a","5280c8ce1","5280c8ce1","2597aea40","2597aea40","7789f2fe0","7789f2fe0","8b806df4f","8b806df4f","d8b7a240e",
"d8b7a240e","ec9945c28","ec9945c28","8a4df47de","8a4df47de","236c849ae","236c849ae","4dfe2725e","4dfe2725e","9ddb23eba","9ddb23eba",
"cf3110a17","cf3110a17","87e15da4b","87e15da4b","774f27d86","774f27d86","4c9685040","4c9685040","ceaee45be","ceaee45be","eb62dc607",
"eb62dc607","8c009f695","8c009f695","bac66017e","bac66017e","142a0650f","142a0650f","946ba9ee3","946ba9ee3","b2fcb4ba1","b2fcb4ba1",
"3b0dab557","3b0dab557","7b9e0ff7e","7b9e0ff7e","7a22ab790","7a22ab790","2bcee754d","2bcee754d","2f49463fb","2f49463fb","fbf0f524c",
"fbf0f524c","db7820216","db7820216","1f48b1e2b","1f48b1e2b","e700efdc7","e700efdc7","5f9a59b3c","5f9a59b3c","b44f0169f","b44f0169f",
"8343addb7","8343addb7","3e1d1dbcc","3e1d1dbcc","339f4fd33","339f4fd33","522617776","522617776","f2ee50293","f2ee50293","670b38315",
"670b38315","b350ba865","b350ba865","2419c4c6d","2419c4c6d","cdafa76e1","cdafa76e1","10da3eda1","10da3eda1","0a0eac1bb","37f6da89e",
"3849abd26","3093aa456","6336f47fd","14908b73a","6470074d0","3b19be9dd","9a5ede16d","403168a34","e19b540e3","62764a89f","a1f03f3ad",
"cdf67e2fe","04513f5bf","92c107c21","29b060c98","b343b9a61","1fb139e9c","b1cf20883","c3cb7558b","64f51da9f","b4ee673c1","9615b0622",
"b33578010","4f9fe5261","f794e2a14","032b6f039","42bff8aed","e83184877")

Are there any duplicates? If so, which IDs are duplicated?