how many collaborations did key release during 2010?
3
col : year | album | song | duration | artist row 1 : 2010 | trax mini album volume up | "healing" |  | with trax row 2 : 2010 | oh! | "boys & girls" |  | with girls' generation row 3 : 2010 | 1st asia tour "into the new world" | "barbie girl" |  | duet with jessica row 4 : 2012 | history of salary man ost | "bravo" | 03:12 | duet with leeteuk row 5 : 2012 | one dream (single) | "one dream" | 02:29 | with boa & henry row 6 : 2012 | mama | "two moons" | 02:59 | with exo row 7 : 2012 | only one | "one dream" | 02:29 | with boa & henry row 8 : 2014 | toheart | "delicious" |  | duet with woohyun from infinite
how many collaborations did key release during 2010?
Year Album Song Duration Artist
2010 TRAX Mini Album Volume Up "Healing" with TRAX
2010 Oh! "Boys & Girls" with Girls' Generation
2010 1st Asia Tour "Into The New World" "Barbie Girl" Duet with Jessica
2012 History of Salary Man OST "Bravo" 03:12 Duet with Leeteuk
2012 One Dream (Single) "One Dream" 02:29 with BoA & Henry
2012 MAMA "Two Moons" 02:59 with EXO
2012 Only One "One Dream" 02:29 with BoA & Henry
2014 Toheart "Delicious" Duet with Woohyun from Infinite
3