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What is 1 + 3?
Classical Roots A2 (Numbers)
a group of three literary or musical works that have a related theme
to divide into three parts
a group of three, especially in authority
(mathematics) a quarter of a circle or of its circumference OR an early machine for altitudes OR any of the four parts of an area divided by perpendicular lines
a musical composition for four voices or instruments OR a set of four, especially of four musicians
a stanza or group of four lines of poetry
to destroy a large part of OR to kill one in every ten
an athletic contest in which each contestant takes part in ten events
a two-hundreth anniversary
pertaining to a 100-year period OR a centennial
referring to a thermometer scale of 100 degress where water freezes at 0 degrees and boils at 100 degrees