What is the sum of the game with a PWin% of , Term [c] of 1987 1988, and Win% less than 0.506?
CREATE TABLE table_69972 (
    "Name [b ]" text,
    "Term [c ]" text,
    "Games" real,
    "Win%" real,
    "PWin%" text
)
SELECT SUM("Games") FROM table_69972 WHERE "PWin%" = '—' AND "Term [c ]" = '1987–1988' AND "Win%" < '0.506'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the sum of the game with a PWin% of , Term [c] of 1987 1988, and Win% less than 0.506? ### Input: CREATE TABLE table_69972 (
    "Name [b ]" text,
    "Term [c ]" text,
    "Games" real,
    "Win%" real,
    "PWin%" text
) ### Response: SELECT SUM("Games") FROM table_69972 WHERE "PWin%" = '—' AND "Term [c ]" = '1987–1988' AND "Win%" < '0.506'