问如何正确使用`always`块？

EN

input wire CLOCK;
input wire [31:0] OUT_SQRT;
output wire [31:0] IN_SQRT;
input wire [31:0] RANDP;

integer randp;
integer flagp;
integer sqrootp;
integer check_primep;

always @(posedge CLOCK and flagp != 0)
begin
    #10
    @(posedge and flagp != 0 )
    begin
        flagp = sqrootp%check_primep;

        if(flagp != 0 and check_primep < sqrootp)
        begin
            check_primep = check_primep + 1;
        end

        @(posedge and flagp == 0)
        begin
            flagp = 1;
            check_primep = 2;
            randp = RANDP;
            #5
            IN_SQRT = randp;
            #10
            sqrootp = OUT_SQRT;
        end
end