lasers used
lasing threshold
lasing wavelength
last
last 30 days
last 500 years
last administration
last ca
last case
last century
last common ancestor
last contact

last couple
last day
last decade
last dental visit
last dose
last evaluation
last examination
last exon
last feature
last fire
last follow-up
last follow-up visit
last frontier

last generation
last glacial
last glacial cycle
last glacial period
last glaciation
last group
last half
last half century
last hour
last ice age
last infusion
last injection
last larval

last line
last longer
last menstrual period
last millennium
last minute
last month
last observation
last part
last period
last phase
last quarter
last resort
last result

last round
last section
last session
last several decades
last several years
last stage