P3L1A1C3E1H4O1L1D2E1R1S1
20 points
PLACEHOLDERS is validvalid
PLACEHOLDER, one that holds a place [n]
PLACEHOLDER, a symbol in a mathematical or logical expression that may be replaced by the name of any element of a set [n]
PLACEHOLDER, one that holds a place [n]
PLACEHOLDER, a symbol in a mathematical or logical expression that may be replaced by the name of any element of a set [n]