How to find different elements between two string vectors in R?

Just like numerical vectors, we can find the different elements between two string vectors if there exists any. For this purpose, we can use setdiff function. For example, if we have a vector V1 that contains a, b, c, d, e, f and the other vector V2 that contains a, e, h, k, l, p, r, u, v, w then the different elements between these two vectors can be found as setdiff(V1,V2).
 Live Demo
x1<-LETTERS[1:26]
x1
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S"
[20] "T" "U" "V" "W" "X" "Y" "Z"
 Live Demo
x2<-LETTERS[5:21]
x2
[1] "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" "T" "U"
setdiff(x1,x2)
[1] "A" "B" "C" "D" "V" "W" "X" "Y" "Z"
 Live Demo
x3<-c("Alabama", "Alaska", "American Samoa", "Arizona", "Arkansas", "California", "Colorado", "Connecticut", "Delaware", "District of Columbia", "Florida", "Georgia", "Guam", "Hawaii", "Idaho", "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky", "Louisiana", "Maine", "Maryland", "Massachusetts", "Michigan", "Minnesota", "Minor Outlying Islands", "Mississippi", "Missouri", "Montana", "Nebraska", "Nevada", "New Hampshire", "New Jersey", "New Mexico", "New York", "North Carolina", "North Dakota", "Northern Mariana Islands", "Ohio", "Oklahoma", "Oregon", "Pennsylvania", "Puerto Rico", "Rhode Island", "South Carolina", "South Dakota", "Tennessee", "Texas", "U.S. Virgin Islands", "Utah", "Vermont", "Virginia", "Washington", "West Virginia", "Wisconsin", "Wyoming")
x3
[1] "Alabama" "Alaska"
[3] "American Samoa" "Arizona"
[5] "Arkansas" "California"
[7] "Colorado" "Connecticut"
[9] "Delaware" "District of Columbia"
 [11] "Florida" "Georgia"
[13] "Guam" "Hawaii"
[15] "Idaho" "Illinois"
[17] "Indiana" "Iowa"
[19] "Kansas" "Kentucky"
[21] "Louisiana" "Maine"
[23] "Maryland" "Massachusetts"
[25] "Michigan" "Minnesota"
[27] "Minor Outlying Islands" "Mississippi"
[29] "Missouri" "Montana"
[31] "Nebraska" "Nevada"
[33] "New Hampshire" "New Jersey"
[35] "New Mexico" "New York"
[37] "North Carolina" "North Dakota"
[39] "Northern Mariana Islands" "Ohio"
[41] "Oklahoma" "Oregon"
[43] "Pennsylvania" "Puerto Rico"
[45] "Rhode Island" "South Carolina"
[47] "South Dakota" "Tennessee"
[49] "Texas" "U.S. Virgin Islands"
[51] "Utah" "Vermont"
[53] "Virginia" "Washington"
[55] "West Virginia" "Wisconsin"
[57] "Wyoming"
 Live Demo
x4<-c("Alabama", "Alaska", "American Samoa", "Arizona", "Arkansas", "California","Florida", "Georgia", "Guam", "Hawaii", "Idaho", "Louisiana", "Maine", "Maryland", "Mississippi", "Missouri", "New Jersey", "New Mexico", "New York", "North Carolina", "Puerto Rico", "Rhode Island", "South Carolina", "South Dakota", "Tennessee")
x4
[1] "Alabama" "Alaska" "American Samoa" "Arizona"
[5] "Arkansas" "California" "Florida" "Georgia"
[9] "Guam" "Hawaii" "Idaho" "Louisiana"
[13] "Maine" "Maryland" "Mississippi" "Missouri"
[17] "New Jersey" "New Mexico" "New York" "North Carolina"
[21] "Puerto Rico" "Rhode Island" "South Carolina" "South Dakota"
[25] "Tennessee"
setdiff(x3,x4)
[1] "Colorado" "Connecticut"
[3] "Delaware" "District of Columbia"
[5] "Illinois" "Indiana"
[7] "Iowa" "Kansas"
[9] "Kentucky" "Massachusetts"
[11] "Michigan" "Minnesota"
[13] "Minor Outlying Islands" "Montana"
[15] "Nebraska" "Nevada"
[17] "New Hampshire" "North Dakota"
[19] "Northern Mariana Islands" "Ohio"
[21] "Oklahoma" "Oregon"
[23] "Pennsylvania" "Texas"
[25] "U.S. Virgin Islands" "Utah"
[27] "Vermont" "Virginia"
[29] "Washington" "West Virginia"
[31] "Wisconsin" "Wyoming"
 Live Demo
x5<-c("AK", "AL", "AR", "AS", "AZ", "CA", "CO", "CT", "DC", "DE", "FL", "GA", "GU", "HI", "IA", "ID", "IL", "IN", "KS", "KY", "LA", "MA", "MD", "ME", "MI", "MN", "MO", "MP", "MS", "MT", "NC", "ND", "NE", "NH", "NJ", "NM", "NV", "NY", "OH", "OK", "OR", "PA", "PR", "RI", "SC", "SD", "TN", "TX", "UM", "UT", "VA", "VI", "VT", "WA", "WI", "WV", "WY")
x5
[1] "AK" "AL" "AR" "AS" "AZ" "CA" "CO" "CT" "DC" "DE" "FL" "GA" "GU" "HI" "IA"
[16] "ID" "IL" "IN" "KS" "KY" "LA" "MA" "MD" "ME" "MI" "MN" "MO" "MP" "MS" "MT"
[31] "NC" "ND" "NE" "NH" "NJ" "NM" "NV" "NY" "OH" "OK" "OR" "PA" "PR" "RI" "SC"
[46] "SD" "TN" "TX" "UM" "UT" "VA" "VI" "VT" "WA" "WI" "WV" "WY"
 Live Demo
x6<-c("AK", "CA", "CO", "CT", "HI", "IA", "ID", "IL", "MD", "ME", "MI", "MN", "MO", "MP", "MS", "MT", "NC", "ND", "NE", "NH", "OR", "PA", "PR", "RI", "SC")
x6
[1] "AK" "CA" "CO" "CT" "HI" "IA" "ID" "IL" "MD" "ME" "MI" "MN" "MO" "MP" "MS"
[16] "MT" "NC" "ND" "NE" "NH" "OR" "PA" "PR" "RI" "SC"