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<?php for( $i = 1; $i < 20; $i++ ) { echo 0.5 * ( 1 * $i + pow( -1, $i ) - 1 ) . ', '; }
Output for git.master, git.master_jit, rfc.property-hooks
-0.5, 1, 0.5, 2, 1.5, 3, 2.5, 4, 3.5, 5, 4.5, 6, 5.5, 7, 6.5, 8, 7.5, 9, 8.5,

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