#include<cstdio>
#include<cstring>
#define MAX(x,y) ((x)>(y)?(x):(y))
#define INF 0x3f3f3f3f
double dp[60][60];
int d[60];
char str[60][60];
int main()
{
int T;
scanf("%d",&T);
while(T--)
{
int m,t;
char str[60];
scanf("%d%d",&m,&t);
memset(d,0,sizeof(d));
for(int i=1;i<=m;i++)
{
scanf("%s",str);
if(str[0]!='L')
sscanf(str,"%d",&d[i]);
else
d[i]=INF;
}
memset(dp,0,sizeof(dp));
dp[0][0]=1;
d[m+2]=-1;
double ans=0;
for(int i=0;i<t;i++)
{
for(int j=0;j<=m;j++)
{
if(d[j+1]==INF)
dp[i+2][j+1]+=dp[i][j]*0.5;
else
dp[i+1][j+1+d[j+1]]+=dp[i][j]*0.5;
if(d[j+2]==INF)
dp[i+2][j+2]+=dp[i][j]*0.5;
else
dp[i+1][j+2+d[j+2]]+=dp[i][j]*0.5;
}
ans+=dp[i+1][m+1];
}
if(ans==0.5)
printf("Push. 0.5000\n");
else
if(ans>0.5)
printf("Bet for. %.4f\n",ans);
else
printf("Bet against. %.4f\n",ans);
}
}
