c("storage method: Liquefied storage", "purification method: PureSperm cushion")
c("storage method: Liquefied storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Pelleted storage", "purification method: PureSperm cushion")
c("storage method: Pelleted storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Liquefied storage", "purification method: PureSperm cushion")
c("storage method: Liquefied storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Pelleted storage", "purification method: PureSperm cushion")
c("storage method: Pelleted storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Liquefied storage", "purification method: PureSperm cushion")
c("storage method: Liquefied storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Pelleted storage", "purification method: PureSperm cushion")
c("storage method: Pelleted storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Liquefied storage", "purification method: PureSperm cushion")
c("storage method: Liquefied storage", "purification method: Somatic Cell Lysis Buffer")
c("storage method: Pelleted storage", "purification method: PureSperm cushion")
c("storage method: Pelleted storage", "purification method: Somatic Cell Lysis Buffer")